BMW Cooling System Parts & Accessories for BMW Z3 (1996-2002)

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The cooling system is arguably the weakest point in numerous BMWs. If you drive an aging BMW or plan on taking your car to the track like we do, we recommend beefing up your cooling system before going to the track. Generally, the main components in your cooling system that are prone to failure include the following: expansion tank, factory hoses, water pump, thermostat, fan (especially if your vehicle comes factory with a clutch fan), and radiator. Factory BMW expansion tanks are plastic and prone to either breaking off at connection points or combusting. As factory rubber hoses age they either crack or break over time - we offer silicone cooling hose upgrades for most applications to avoid future failures. If you have an older vehicle, your water pump likely comes from the factory with a plastic impeller - we offer upgraded water pumps with metal impellers that are far more reliable. Newer model BMWs utilize electric water pumps - BMW spent millions of dollars engineering these water pumps, but they fail so often that we recommend replacing at 60,000 mile service intervals to avoid being stranded on the side of the road. In terms of thermostats, we offer various upgraded thermostats for racing applications. If your BMW utilizes a clutch fan from the factory, we have several options available in terms of universal electric fans - we recommend replacing these to avoid sending brittle plastic fan blades through your hood. For radiators, we recommend swapping out your radiator for one that does not use plastic connection points like your factory radiator.

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Cooling Hose from Expansion Tank - Z3 M Roadster M Coupe (S54) ...
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Genuine BMW - Corporate Logo
T#:36152
Part#: 11537830994
Ships in 7 Business Days
$ 28.99 USD
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This is the rubber cooling hose that goes from the coolant expansion tank to the water pipe that leads back to the thermostat housing.

This item fits the following BMWs:
2001-2002 Z3 BMW Z3 M Roadster M Coupe with S54 engine
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Motorsport Thermostat - 60C - Complete with Housing - M54 / M52tu ...
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Genuine BMW Motorsport - Corporate Logo
T#:1171
Part#: TMS1171
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$ 415.45 USD
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$ 415.45 USD
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This is a genuine BMW Motorsport part, designed specifically for BMW racing applications. We use this exact thermostat setup in our Championship-winning E46 330i race car. It is designed to be used on all M54 and M52TU double-VAN0S engines, as used in the 1999-2000 E46 323/328 and 2001-2005 E46 325/330. This 60 degree C (140 defrees F) thermostat comes complete with plastic thermostat housing. It does not use the plug and wiring for the stock DME so this should only be used with an aftermarket engine management system (Motec, Bosch, etc).

When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.
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Heater Inlet Pipe
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Febi - Corporate Logo
T#:594084
Part#: 11531705210
Ships on Jul 24, 2026
$ 47.46 USD
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Runs from the front left side of the engine to the heater inlet

Genuine BMW Radiator support - right - E36
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Genuine BMW - Corporate Logo
T#:70034
Part#: 41118122558
Ships in 4 Business Days
$ 26.99 USD
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Genuine BMW Support For Right Radiator
This item fits the following BMW Chassis:
E36 M3,E36


Fan Clutch Wrench - 32mm
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CTA Tools - Corporate Logo
T#:641760
Part#: CTAA878
Ships on Jul 24, 2026
$ 23.57 USD
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Use to remove and install Fan Clutch Assemblies when replacing Water Pumps or doing other Engine Services
Febi Radiator Fan Clutch - E34, E36, E39, E46, E53, Z3
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Febi - Corporate Logo
T#:382395
Part#: 11527505302
Ships on Oct 5, 2026
$ 187.99 USD
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$ 187.99 USD
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Common source of engine overheating

Febi Thermostat - 88°C - E30, E34, E36, Z3
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Febi - Corporate Logo
T#:382407
Part#: 11537511580
Ships on Oct 5, 2026
$ 32.99 USD
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Includes sealing O-ring gasket
Water Pump and Seal - with upgraded metal impeller - MEYLE
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Meyle - Corporate Logo
T#:579324
Part#: 11517509985
Ships on Nov 16, 2026
$ 52.99 USD
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Ensure the optimal performance of your BMW by addressing the crucial component of the water pump. Turner Motorsport provides high-quality water pumps designed to keep coolant flowing smoothly. If left unchecked, a failing water pump can lead to overheating issues, potentially causing damage to engine internals. Common among German vehicles, water pump failure may result in unnecessary visits to the repair shop. Preventive maintenance, especially during timing belt replacements, is essential to avoid rapid coolant temperature rise and potential engine damage.

  • Prevents overheating issues
  • Guards against engine damage
  • Common replacement during timing belt maintenance
  • Ensures smooth coolant flow for optimal engine performance
  • Options for thermostats available on Turner Motorsport's website
  • Convenient coolant replacement options
  • Recommended replacement around 60,000 miles
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Meyle Coolant Expansion Tank - E36, E39, Z3
Up to production date 09/1998
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Meyle - Corporate Logo
T#:556111
Part#: 17111723520
Ships on Nov 16, 2026
$ 34.99 USD
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$ 34.99 USD
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Does not include cap or coolant level sensor

Fan Blade
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Meyle - Corporate Logo
T#:594536
Part#: 11521723363
Ships on Nov 16, 2026
$ 32.99 USD
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This fan is driven by the belt, engaged by the fan clutch. If you have bad motor mounts, it's quite common for the blades of this fan to make contact with the radiator or radiator shroud, essentially self-destructing the fan into many peices. Be sure to get a new fan clutch, while you are replacing this.
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Nissens Radiator With Expansion Tank - E30, E36, Z3
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Nissens - Corporate Logo
T#:361204
Part#: 17111728907
Ships in 6 Business Days
$ 184.99 USD
$ 184.99 USD
Keep your engine running cool when the temperature rises
URO Auxiliary Fan Switch – 80-88°C - E36 Z3 M44
For vehicles with production date from 07/1996 to 03/1997
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URO - Corporate Logo
T#:361655
Part#: 61318361787
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$ 26.99 USD
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$ 26.99 USD
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Restore the function of your fans.


Sachs Radiator Fan Clutch - E34, E36, E39, E46, E53, Z3
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Sachs - Corporate Logo
T#:591739
Part#: 11527505302
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$ 133.99

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$ 129.99 USD
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Common source of engine overheating
ACM Auxiliary Fan Assembly - Suction - E36, Z3
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ACM - Corporate Logo
T#:371894
Part#: 64508372039
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$ 166.99 USD
$ 166.99 USD
Mounted behind the radiator
URO Premium Aluminum Water Pipe - BMW M52TU M54
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T#:587659
Part#: 11537502525PRM
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$ 71.99 USD
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$ 71.99 USD
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This plastic coolant water pipe connects the expansion tank return hose with the engine block

Genuine BMW Coolant Temperature Sensor - E36 318i 318ti M44 1.9L, Z3 ...
For vehicles with production date from 03/1997
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Genuine BMW - Corporate Logo
T#:368512
Part#: 61318376440
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6% off MSRP $ 120.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 113.99 USD
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6% off MSRP
$ 120.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 113.99 USD
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Motorsport Thermostat - 55 (NO LONGER AVAILABLE)
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Genuine BMW Motorsport - Corporate Logo
T#:337991
Part#: 11531417215
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Starting at $ 232.98 USD
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Starting at $ 232.98 USD
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E46M3 Motorsport Thermostat 55C (Also fits Euro E36 M3 engine) A Genuine BMW part this thermostat opens at a much lower temperature than stock to keep your S54 engine (or Euro S50/S52 engine) running cooler in race applications.
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Moroso Performance Aluminum Expansion Tank - E36, Z3
For vehicles with a production date before 09/1998
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Moroso - Corporate Logo
T#:568887
Part#: 63791
In Stock
$ 445.99 USD
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$ 445.99 USD
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If you have ever experienced a leaking plastic BMW expansion tank you will realize the value of this aluminum version straight away. Even if a failure has not happened to you, it's easy to tell this tank is much stronger and more durable than the plastic used in the stock design. The original BMW plastic tanks suffer from leaks and failures with no warning. While being lightweight and recyclable the design and construction of the stock tank is just not up for reliable long term use. Moroso coolant expansion tanks are all pressure tested for guaranteed leak-free operation and utilizes the stock pressure cap to prevent excessive pressure in the cooling system from blowing off a radiator hose or seal! Features: Each cooling system expansion tank includes a 1/8 in. pipe overflow fitting at neck, a 1/4 in. NPT water intake bung, and a 1/2 in. bung at the bottom for plumbing a line to the radiator Rugged 6061-T6 billet aluminum filler necks welded to tank to withstand continuous removal and installation of cap 100% pressure tested to eliminate leaks Accepts a standard-size radiator cap
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Schwaben 32mm / 36mm Fan Clutch and Oil Filter Cap Open-End Wrench ...
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Schwaben - Corporate Logo
T#:361021
Part#: DO-3236
In Stock
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This product was last offered at the strikethrough price on
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$ 19.49 USD
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Why buy two tools when you can get one that will do many jobs like this open end wrench? It is great for removing and installing the fan clutch and plastic oil filter cap. Also works great for removing and installing the VAN0S solenoid on M50 engine family. Use the same tools the Turner Motorsport tech's use!

Features:

  • Made of Chrome Vanadium Steel for strength
  • 32/36mm open end sides

 

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Febi Radiator Hose - Upper - E36, Z3
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Febi - Corporate Logo
T#:363807
Part#: 11531708499
In Stock
$ 16.99 USD
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New upper radiator hose for your BMW

Genuine BMW Coolant Bleeder Screw 17111712788
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Genuine BMW - Corporate Logo
T#:7432
Part#: 17111712788
In Stock
$ 5.94 USD
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This is the Genuine BMW Coolant bleeder screw. We recommend a heavy duty Aluminum replacement from ECS Tuning if you do not want to replace this part again when it fails.


Genuine BMW Vent Screw
This item fits the following BMW Chassis:
E36 M3,E46 M3,E85 Z4M,E53 48IS,E30,E34,E36,E38,E39,E46,E53 X5 X5,E83 X3,E85 Z4,E86 Z4,E90
 

 

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Cooling Hose
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Bremmen Parts - Corporate Logo
T#:38688896
Part#: 13541703865
In Stock
Sale - Save 26% $ 10.99

This product was last offered at the strikethrough price on
05-03-2026

$ 8.15 USD
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$ 10.99

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$ 8.15 USD
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90-110mm 3/8"/9mm Band Hose Clamp
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ECS - Corporate Logo
T#:341281
Part#: 003402ECS06A-13
In Stock
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$ 4.19 USD
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$ 6.99

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$ 4.19 USD
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ECS Tuning 304 Stainless Steel Hose Clamps

Once again, ECS Tuning has found a way to make life easier for working on your car. Need new hose clamps but don't want to wait to order it from the dealership or pay more than you should for a hose clamp? That's where we come in! These are full 304 stainless steel hose clamps with various band widths for your convenience. They are German style using T-bolts to adjust in size to your required diameter. Never pay dealer pricing again, but still get the quality you love here at ECS Tuning.

  • Made from high-quality 304 stainless steel for durability
  • German-style design with T-bolts allows for easy size adjustment
  • Various band widths for versatile use
  • Avoid dealership pricing without compromising on quality
  • Perfect for BMW enthusiasts seeking affordable yet reliable hose clamps
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Bav Auto Coolant Temperature Sensor - M52/S52, M62, M73, M54, S62 ...
For vehicles with production date up to 09/1998
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Bavarian Autosport - Corporate Logo
T#:639828
Part#: 13621703993
Ships on Oct 5, 2026
Sale - Save 20% $ 20.99

This product was last offered at the strikethrough price on
05-03-2026

$ 16.79 USD
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$ 20.99

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This is the coolant temperature sensor used in many BMW models from the mid-1990s to the mid-2000s. The engine computer relies on the coolant temp to set the fuel mapping for the engine. As the car warms up the computer changes the fuel mixture. If your car is running a bit rich (too much fuel) it could be because this sensor is failing and not sending the correct info to the computer. This sensor is located in a variety of places depending on the engine. But it's one of those easy replacement items 'while you're in there' when doing a water pump or thermostat replacement. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.
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Bremmen Coolant Bleeder Screw - BMW E30 E36 E38 E39 E46 E83 E90 Z4 ...
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Bremmen Parts - Corporate Logo
T#:640140
Part#: 17111712788
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This product was last offered at the strikethrough price on
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$ 2.44 USD
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$ 3.99

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$ 2.44 USD
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Plastic bleeder screw for cooling system is used to bleed air that would otherwise create an air pocket and lead to overheating. Includes o-ring seal.
Schwaben Radiator/ Intercooler Fin Comb
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Schwaben - Corporate Logo
T#:384260
Part#: 015326SCH01A
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This product was last offered at the strikethrough price on
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$ 14.99 USD
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$ 20.99

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Straighten bent fins in heat exchangers like radiators, condensers, and intercoolers obstruct air flow and reduce heat transfer. Paper-thin fins are easily bent, even by slight pressure.
Rein Coolant Bleeder Screw CHW1575 - Priced Each
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Rein - Corporate Logo
T#:591955
Part#: 17111712788
In Stock
$ 4.99 USD
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Coolant Bleeder Screw is a critical component for maintaining your BMW’s cooling system. Designed to release trapped air from the coolant lines, this screw ensures efficient coolant flow and prevents overheating. Specifically engineered for BMW models, it enhances the overall performance and longevity of your engine by maintaining proper temperature regulation. Comes with O-Ring.
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FAE Coolant Temperature Sensor - E31, E36, E38, E39, E52, E53, Z3 ...
For vehicles with production date up to 09/1998
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FAE - Corporate Logo
T#:374002
Part#: 13621703993
In Stock
$ 15.99 USD
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$ 15.99 USD
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Monitors coolant temperature

E36 Z3 Upper Radiator Bracket
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Genuine BMW - Corporate Logo
T#:7441
Part#: 17111723341
In Stock
$ 10.39 USD
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When replacing or removing a radiator on an E36 or Z3, we recommend replacing these upper brackets as they tend to crack / break when removing them. Sold individually.

When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.

This item fits the following BMWs:
1992-1998 E36 BMW 318i 318is 318ti 318ic 323is 323ic 325i 325is 325ic 328i 328is 328ic M3
1996-2002 Z3 BMW Z3 1.9 Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i M Roadster M Coupe
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BMW Antifreeze Coolant - 1 Liter Bottle
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Genuine BMW - Corporate Logo
T#:11526
Part#: 82142209769
In Stock
$ 10.51 USD
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This 1 liter bottle is perfect for topping of the coolant in your BMW. This is The use of Original BMW Anti-Freeze/Coolant will ensure sufficient cooling in summer and protection against freeze-ups in winter. BMW Antifreeze/Coolant will also guard your vehicle's various engine components against corrosion. BMW Anti-Freeze/ Coolant will prevent excessive silicate gel precipitation, which may cause plugging of the cooling system and lead to more extensive repairs.
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Genuine BMW Engine O-ring S54 3.2L 11537830709
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Genuine BMW - Corporate Logo
T#:13012
Part#: 11537830709
In Stock
$ 6.99 USD
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Ensure your BMW remains leak-free by replacing all associated O-Rings when replacing the water pump. If experiencing leaks, inspect these rings for wear and tear. This O-Ring is specifically used on the return pipe to the thermostat housing.

  • Prevents leaks for enhanced car performance
  • Essential for maintaining a leak-free system
  • Inspects and replaces worn O-Rings for optimal functionality
  • Compatible with BMW models for hassle-free installation
GENUINE BMW O-RING:11709521.--

This item fits the following BMWs:
BMW M Series - M3, M3 Convertible
BMW Z Series - Z4 M Coupe, Z4 M Roadster

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Genuine BMW O-Ring - Priced Each
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Genuine BMW - Corporate Logo
T#:367933
Part#: 17222245358
In Stock
$ 3.99 USD
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Upgrade your BMW's oil or transmission cooling system with the Turner Motorsport Genuine O-Ring, part number 17222245358. This high-quality O-ring is designed to provide a reliable seal, ensuring optimal performance and preventing leaks in your BMW's vital systems. Additionally, it is compatible with MINI applications, where it is commonly used on the end of the parking brake cable.

  • Genuine BMW part for guaranteed quality and compatibility
  • Prevents leaks in the oil and transmission cooling systems
  • Ensures optimal performance of vital components
  • Compatible with MINI applications for versatile use
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OEM Behr Coolant Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3 ...
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Mahle-Behr - Corporate Logo
T#:2766
Part#: 17111742231
In Stock
$ 19.99 USD
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This radiator expansion tank cap is used most BMW's from 1991-2006. It is a common failure item. When this item fails, it cannot hold pressure which results in your BMW overheating. If you are overhauling your coolant system, now is the time to consider preventative replacing this cap. It is also referred to as the coolant reservoir cap.

Hailing from Stuttgart, Mahle-Behr specializes in automotive cooling systems. From air conditioning to engine cooling M-B has you covered with OE-quality replacement parts.

This item fits the following BMWs:
1990-1991 E30 BMW 318i 318is 318ic
1992-1998 E36 BMW 318i 318is 318ic 323is 323ic 325i 325is 325ic 328i 328is M3
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi M3
1989-1995 E34 BMW 530i 535i 540i M5
1991-1995 E34 BMW 525i
1997-2003 E39 BMW 525i 528i 530i 540i M5
1989-1994 E32 BMW 735i 735il 740i 740il 750il
1995-2001 E38 BMW 740i 740il 750il
2002-2008 E65 BMW 745i 745li 750i 750li 760i 760li
1990-1998 E31 BMW 840i 840ci 850i 850ci 850csi
2004-2011 E83 BMW X3 2.5i X3 3.0i X3 3.0si
2000-2006 E53 BMW X5 30.0i X5 4.4i X5 4.6is X5 4.8is
1996-2002 Z3 BMW Z3 1.9 Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i M Coupe M Roadster
2003-2008 E85 BMW Z4 2.5i Z4 3.0i Z4 3.0si M Roadster M Coupe
2000-2003 E52 BMW Z8 Z8 Alpina
2007+ E90 BMW 335i & 335xi
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Radiator Hose - Upper
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Bremmen Parts - Corporate Logo
T#:38688897
Part#: 11531708499
In Stock
Sale - Save 24% $ 14.99

This product was last offered at the strikethrough price on
05-03-2026

$ 11.42 USD
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$ 14.99

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$ 11.42 USD
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Victor Reinz Water Pump O-Ring - E34, E36, E39, E46, E53, E60, E83, Z...
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Victor Reinz - Corporate Logo
T#:361076
Part#: 11511711484
In Stock
$ 2.03 USD
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Solve your water pump leak
BMW Brass Coolant Bleeder Screw - Priced Each
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URO Premium - Corporate Logo
T#:587673
Part#: 17111712788PRM
In Stock
$ 5.75

This product was last offered at the strikethrough price on
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$ 5.35 USD
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$ 5.35 USD
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Having an operational bleeder screw for your coolant system assures that when service is performed, all air pockets are removed. Having air pockets in your coolant system prevents your system from functioning properly. Your heat may not work as well and there is the potential for engine overheating if the air pocket is trapped behind the thermostat. Be sure that all of the air is bled out of your system with a new bleeder screw.
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Radiator Fan Switch Plug - E30, E34, E36, E23, E32
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Race German - Corporate Logo
T#:23947130
Part#: E30RADFANSP
In Stock
$ 17.99 USD
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Thanks to its brittle plastic construction, this radiator fan switch plug is a common failure point. Race German offers this high-quality replacement to remedy this issue and get your car back to perfect operation.
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BMW Expanding Rivet
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Genuine BMW - Corporate Logo
T#:7436
Part#: 17111712963
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$ 1.99 USD
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The most common use for this rivet is to secure the radiator fan shroud to the radiator. This rivet can also be used on a wide variety of other applications as well.

When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.
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Febi Expansion Tank Hose - E36, Z3
For vehicles with production date up to 09/1998
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Febi - Corporate Logo
T#:363760
Part#: 17111723521
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$ 15.99 USD
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$ 15.99 USD
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Connects the expansion tank to the radiator

Coolant Hose - Overflow from Expansion Tank to Radiator - E36, Z3 ...
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T#:13181
Part#: 17111723521
In Stock
$ 6.42 USD
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This is the small diameter overflow hose that goes from the coolant expansion tank to the radiator.

This item fits the following BMWs:
1992-1998 E36 BMW 323is 323ic 325i 325is 325ic 328i 328is 328ic M3
1997-1998 Z3 BMW Z3 2.8
1998-2000 Z3 BMW M Roadster M Coupe
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Band Hose Clamp | 12-20mm 3/8"/9mm
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ECS - Corporate Logo
T#:304266
Part#: 003402ECS06A-03
In Stock
Sale - Save 25% $ 4.99

This product was last offered at the strikethrough price on
06-13-2026

$ 3.74 USD
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Sale - Save 25%
$ 4.99

This product was last offered at the strikethrough price on
06-13-2026

$ 3.74 USD
Free Shipping on orders $49 and up
Secure hoses in your BMW effortlessly with the ECS 3/8" / 9mm Band Hose Clamp (12-20mm). Specifically designed for BMW models, this clamp ensures a snug fit and reliable hold for hoses measuring between 12mm to 20mm. Crafted with durable materials, these clamps provide exceptional resistance against leaks and are ideal for various automotive applications. Upgrade your BMW's hose security with these reliable ECS hose clamps.
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Thermostat Housing Gasket - M50, M52, S50, S52
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Genuine BMW - Corporate Logo
T#:407610
Part#: 11531740437
In Stock
12% off MSRP $ 13.55

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 11.90 USD
Free Shipping on orders $49 and up
12% off MSRP
$ 13.55

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 11.90 USD
Free Shipping on orders $49 and up
Needs to be replaced once removed

Rein Thermostat O-Ring (60 X 3.5 mm) - E28 E30 E32 E34 E36 E39 Z3 E23...
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2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Rein - Corporate Logo
T#:591144
Part#: 11531265084
In Stock
$ 2.05 USD
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This O-ring seals the thermostat to the cylinder head.
URO Coolant Temperature Sensor - BMW M44 M52 M62 M73 M54 S62 S50 S52 ...
For vehicles with production date up to 09/1998
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2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
URO - Corporate Logo
T#:639497
Part#: 13621703993
In Stock
$ 12.99 USD
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$ 12.99 USD
Free Shipping on orders $49 and up
URO Parts is one of the leading manufacturers of high quality direct replacement aftermarket components, covering a wide range of makes and models. All of their replacement parts are manufactured to ISO 9000 certification standards, so you can expect long lasting performance from URO Parts. As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts. All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!
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Genuine BMW Radiator Drain Plug - E34 E36 Z3
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Genuine BMW - Corporate Logo
T#:45724
Part#: 17111712816
Ships in 1 day
$ 8.99 USD
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Genuine BMW Screw Plug -
This item fits the following BMW Chassis:
E30,E34,E36

Fits BMW Engines including:
M20,M42,M44,M50


Wahler Thermostat O-Ring - E46, Z3, Z4
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Wahler - Corporate Logo
T#:362366
Part#: 11531318402
Ships in 6 Business Days
$ 6.17 USD
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BMW does not include a o-ring with their new thermostats
Red Line Water Wetter Coolant Additive
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Redline - Corporate Logo
T#:394769
Part#: REDLINE5A
In Stock
Starting at $ 15.99 USD
Free Shipping on orders $49 and up
Starting at $ 15.99 USD
Free Shipping on orders $49 and up
Water Wetter is a unique wetting agent for cooling systems which reduces coolant temperatures by as much as 30*F. This liquid product can be used to provide rust and corrosion protection in plain water for racing engines, which provides much better heat transfer properties than glycol-based antifreeze.
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Bav Auto Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3 X5 Z4 ...
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Bavarian Autosport - Corporate Logo
T#:640208
Part#: 17117639022
In Stock
Sale - Save 15% $ 13.99

This product was last offered at the strikethrough price on
06-03-2026

$ 11.89 USD
Free Shipping on orders $49 and up
Sale - Save 15%
$ 13.99

This product was last offered at the strikethrough price on
06-03-2026

$ 11.89 USD
Free Shipping on orders $49 and up
This radiator expansion tank cap is used most BMW's from 1991-2006. It is a common failure item. When this item fails, it cannot hold pressure which results in your BMW overheating. If you are overhauling your coolant system, now is the time to consider preventative replacing this cap. It is also referred to as the coolant reservoir cap. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.
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Red Line Water Wetter Heat Transfer Agent
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Redline - Corporate Logo
T#:3607
Part#: 1-WW-12Z
In Stock
$ 15.99 USD
Free Shipping on orders $49 and up
Water Wetter is a unique wetting agent for cooling systems which reduces coolant temperatures by as much as 30*F. This liquid product can be used to provide rust and corrosion protection in plain water for racing engines, which provides much better heat transfer properties than glycol-based antifreeze. Or it can be added to new or used antifreeze to improve the heat transfer of ethylene and propylene glycol systems. Designed for modern aluminum, cast iron, copper, brass, and bronze systems.

We have been using RedLine Oil in our street cars and race cars for years. Hands-down, it is the Number One brand of high performance lubricant for BMWs.
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OEM Rein Expansion Tank Cap - BMW E32 E34 E36 E38 E39 E46 & More ...
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2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
Rein - Corporate Logo
T#:340541
Part#: 17111742231
In Stock
$ 17.99 USD
Free Shipping on orders $49 and up
This radiator expansion tank cap is used most BMW's from 1991-2006. It is a common failure item. When this item fails, it cannot hold pressure which results in your BMW overheating. If you are overhauling your coolant system, now is the time to consider preventative replacing this cap. It is also referred to as the coolant reservoir cap.
Show More Show Less