Rein 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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BMW M52 M54 Water Pipe
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T#:594294
Part#: 11537502525
In Stock
$ 55.99 USD
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BMW M52 M54 Water Pipe is an essential replacement part designed to ensure long-term reliability and optimal performance for your BMW's cooling system. Engineered to replace cracked or broken coolant pipes, this high-quality water pipe from Turner Motorsport guarantees a perfect fit and dependable service. Investing in this replacement pipe helps prevent overheating and potential engine damage, maintaining your vehicle's performance and longevity.

  • Reliable replacement: Designed to replace cracked or broken coolant pipes for improved engine cooling.
  • Optimal fitment: Engineered to ensure a perfect fit and seamless installation.
  • Durable construction: Built with high-quality materials to withstand engine temperatures and environmental conditions.
  • Preventative maintenance: Helps avoid overheating and potential engine damage by ensuring a reliable coolant flow.
  • Vehicle compatibility: Specifically designed for BMW M52 and M54 engine models.

Upgrade your BMW’s cooling system with the BMW M52 M54 Water Pipe from Turner Motorsport for enhanced reliability and performance.

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Heater Inlet Pipe
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T#:594330
Part#: 11531705210
In Stock
$ 40.99 USD
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This is the plastic heater inlet pipe that connects the cylinder head to the heater inlet on cars with the M52 or M54 engine.The plastic on this hose becomes brittle over time and eventually leads to failure.
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Rein Radiator Hose - Lower - Z3
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T#:363452
Part#: 11531716642
In Stock
$ 39.99

This product was last offered at the strikethrough price on
05-04-2026

$ 28.99 USD
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$ 28.99 USD
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A common source of cooling system failure

Rein Radiator Hose - Upper - Z3
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T#:363438
Part#: 11531716641
In Stock
$ 29.99 USD
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Connects the radiator to the water pump

Rein Thermostat - 88�C - E30, E34, E36, Z3
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T#:591800
Part#: 11537511580
Ships in 3 Business Days
$ 37.99 USD
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Common point of failure in the cooling system.
Rein Coolant Hose - Water Valve - Z3
For vehicles with a production date up to 09/1998
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T#:379696
Part#: 64218400295
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$ 27.99 USD
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$ 27.99 USD
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Return hose for the underhood coolant valve

Thermostat With Housing
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T#:582356
Part#: 11537509227
Ships in 3 Business Days
$ 89.99 USD
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$ 89.99 USD
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Stop leaks before they start with this new Thermostat With Housing from Rein.
Rein Heater Hose - Supply - Z3
For vehicles with a production date up to 09/1998
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T#:379690
Part#: 64218401809
Ships in 3 Business Days
$ 22.99 USD
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$ 22.99 USD
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Supplies the heater core with coolant

Coolant Expansion Tank
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T#:591949
Part#: 17107514964
Ships in 3 Business Days
$ 80.99 USD
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$ 80.99 USD
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Includes bleeder screw

Rein Thermostat O-Ring (60 X 3.5 mm) - E28 E30 E32 E34 E36 E39 Z3 E23...
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T#:591144
Part#: 11531265084
In Stock
$ 2.05 USD
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This O-ring seals the thermostat to the cylinder head.
Rein Radiator Hose - Upper - E36, Z3
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T#:6973
Part#: 11531743535
In Stock
$ 16.99 USD
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OEM BMW ENGINE WATER HOSE 11531743535.--

This item fits the following BMWs:
BMW 3 Series - 318i, 318i Convertible, 318is, 318ti
BMW Z Series - Z3 1.9

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Rein Coolant Bleeder Screw CHW1575 - Priced Each
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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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Rein Water Hose - Z3
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T#:363333
Part#: 11531436988
In Stock
$ 22.99

This product was last offered at the strikethrough price on
03-28-2026

$ 17.99 USD
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$ 17.99 USD
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Serves as a supply line to the radiator
Rein Thermostat - 92C
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T#:34114254
Part#: 11537511083
In Stock
$ 11.99 USD
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Rein Thermostat 92C is an essential component designed to regulate the temperature in BMW engines, ensuring the vehicle runs at optimal performance while preventing overheating. Engineered to open at 92°C, this high-quality thermostat allows for precise coolant flow, keeping the engine at the correct temperature for maximum efficiency. Available at Turner Motorsport, the Rein Thermostat 92C is designed specifically for BMW vehicles, offering a direct-fit replacement that ensures easy installation and reliable operation.

  • Opens at 92°C for precise temperature regulation
  • Designed specifically for BMW engines for perfect fit and compatibility
  • Prevents engine overheating and helps protect critical engine components
  • Enhances overall engine efficiency and performance
  • Manufactured from durable materials for long-lasting reliability
  • Direct-fit replacement for easy installation

The Rein Thermostat 92C is the ideal solution for BMW owners who want to ensure their vehicle’s engine operates efficiently and reliably, providing optimal temperature control and enhanced performance.

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OEM Rein Expansion Tank Return Hose - E36 323is/ic, 328i/is, M3 ...
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T#:14593
Part#: 11531740649
In Stock
$ 29.99

This product was last offered at the strikethrough price on
05-22-2026

$ 18.99 USD
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$ 18.99 USD
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This is the radiator expansion tank return hose for the cooling system on E36 models with the M52 or S52 engine. This hose goes from the expansion tank to the main coolant return pipe.

This item fits the following BMWs:
1996-1998 E36 BMW 323is 323ic 328i 328is 328ic M3
1996-1998 Z3 BMW Z3 2.8
1998-2000 Z3 BMW M Roadster M Coupe
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OEM Rein Expansion Tank Cap - BMW E32 E34 E36 E38 E39 E46 & More ...
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T#:340541
Part#: 17111742231
In Stock
$ 17.99 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.
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OEM Rein Lower Radiator Hose - E36, Z3 M44 1.9L
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T#:6873
Part#: 11531247261
Ships in 1 Business Day
$ 10.99 USD
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Connects the thermostat to the lower radiator. Over time, coolant hoses begin to get brittle and are susceptible to cracking and splitting. Replace your cracked or leaking coolant hose to prevent further leaks and potentially catastrophic failure.

This item fits the following BMWs:
BMW 3 Series - 318i, 318i Convertible, 318is, 318ti
BMW Z Series - Z3 1.9

​Fits BMW Engines including:
M44

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Expansion Tank Hose
For vehicles with production date up to 09/1998
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T#:375751
Part#: 17111723521
Ships in 1 Business Day
$ 16.99 USD
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$ 16.99 USD
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Connects the expansion tank to the radiator

OEM Rein Cooling Hose - E36, Z3
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T#:362532
Part#: 13541703865
In Stock at Vendor
$ 19.83

This product was last offered at the strikethrough price on
05-02-2026

$ 18.99 USD
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$ 18.99 USD
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Over time, coolant hoses begin to get brittle and are susceptible to cracking and splitting. Replace your cracked or leaking coolant hose to prevent further leaks and potentially catastrophic failure.
BMW Expansion Tank With Cap - 17107514964
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T#:46616026
Part#: EPK0025
Ships in 3 Business Days
$ 74.99 USD
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The coolant expansion tank provides a place for excess coolant to flow as temperatures rise and fall. Because it’s exposed to constant heat cycles and pressure changes, it can eventually crack, split, or suffer damage to its nipples or mounting points. Keeping coolant properly contained within the system is essential, so if your tank shows signs of wear or damage, replacement is necessary. This direct-fit replacement installs easily and delivers the same heating and cooling performance as the factory unit. When replacing the tank, be sure to have additional coolant on hand. ECS Tuning carries a full range of vehicle-specific coolants designed to meet OEM specifications. Most German vehicles require specialized formulas—using the correct coolant will help prevent corrosion and ensure long-term reliability.
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OEM Rein Coolant Hose - E36 Z3
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T#:379763
Part#: 11531743295
In Stock at Vendor
$ 13.99 USD
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Over time, coolant hoses begin to get brittle and are susceptible to cracking and splitting. Replace your cracked or leaking coolant hose to prevent further leaks and potentially catastrophic failure.

Rein - Throttle Body Hose - E36 318i, Z3 1.9
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T#:33980410
Part#: 11531247398
Ships in 1 Business Day
$ 6.83 USD
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Throttle Body Hose by Rein is a key component designed to optimize airflow to your BMW’s engine, ensuring enhanced throttle response and overall engine performance. This hose connects the air intake system to the throttle body, delivering a precise flow of air that improves fuel efficiency and engine power. Manufactured from high-quality, heat-resistant materials, the Throttle Body Hose by Rein is built to withstand extreme temperatures and pressures, making it a durable and long-lasting solution for your BMW. Available at Turner Motorsport, this hose is a direct fit replacement, ensuring easy installation and perfect compatibility with OEM standards.

  • Optimizes airflow to the throttle body, improving engine performance and efficiency
  • Enhances throttle response, contributing to smoother acceleration
  • Constructed from durable, heat-resistant materials, ensuring long-lasting performance
  • Direct fit replacement, allowing for easy installation and OEM compatibility
  • Boosts overall engine efficiency, improving fuel economy and engine power

Turner Motorsport offers the Throttle Body Hose by Rein as a reliable solution to maintain your BMW’s air intake system, ensuring smooth and efficient engine operation.

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OEM Rein Upper Radiator Hose - E36 325/328/323/M3
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T#:1299
Part#: 11531708499
In Stock at Vendor
$ 12.99 USD
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This is the coolant hose that connects the upper radiator outlet to the thermostat housing. Any time you are into the cooling system, either for a radiator, water pump, thermostat, etc, you should consider installing fresh new hoses as a preventative measure.

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 with S52 engine
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Coolant Expansion Tank With Cap - 17111712835
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T#:46616014
Part#: EPK0012
Back Ordered
$ 29.99 USD
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The coolant expansion tank provides a place for excess fluid as coolant expands and contracts with temperature changes. Constant exposure to these extremes can cause the tank to crack, break, or suffer damage to its nipples or mounting points. To keep your cooling system sealed and functioning properly, any damaged tank should be replaced.
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Water Pump O-Ring
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T#:592886
Part#: 11511714519
Back Ordered
$ 9.17 USD
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