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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Radiator Hose - Upper
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:373018
Part#: 11531720722
Ships in 1 Business Day
$ 7.99 USD
Free Shipping on orders $49 and up
Hose from radiator to water pump
Spal - Corporate Logo
T#:598910
Part#: 30130013
In Stock at Vendor
$ 6.99 USD
Free Shipping on orders $49 and up
Wire pin used to mount electric fan directly to radiator.
OEM Rein Coolant Hose - E36 Z3
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:379763
Part#: 11531743295
In Stock at Vendor
$ 13.99 USD
Free Shipping on orders $49 and up
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
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:33980410
Part#: 11531247398
Ships in 1 Business Day
$ 6.83 USD
Free Shipping on orders $49 and up

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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Spal - Corporate Logo
T#:598825
Part#: 30130074
In Stock at Vendor
$ 17.99 USD
Free Shipping on orders $49 and up
Provides .25" stand off from radiator, does not work with high output fans.
Water Hose
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:30463940
Part#: 11531743295
Ships in 1 Business Day
$ 16.99 USD
Free Shipping on orders $49 and up

Genuine BMW - Corporate Logo
T#:367704
Part#: 11537509357
Ships in 1 day
14% off MSRP $ 9.74

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

$ 8.33 USD
Free Shipping on orders $49 and up
14% off MSRP
$ 9.74

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

$ 8.33 USD
Free Shipping on orders $49 and up
Needs to be replaced once removed
Genuine BMW - Corporate Logo
T#:55245854
Part#: 1711117XKT
Ships in 1 day
New Item
$ 26.92 USD
Free Shipping on orders $49 and up
This Genuine BMW Lower Radiator Mount and Bracket Refresh Kit supplies the factory-original hardware needed to overhaul your lower radiator supports.

Genuine BMW - Corporate Logo
T#:55281750
Part#: 1722OCLKT
Ships in 1 day
New Item
$ 20.60 USD
Free Shipping on orders $49 and up
This Genuine BMW Oil Cooler Line O-Ring & Screw Kit includes the exact factory components required to safely service your oil cooler hard lines.

Hose Clamp 2 5/16" - 3 1/4" - priced each
10X Entries Into Our F80 M3 Sweepstakes
ECS - Corporate Logo
T#:376806
Part#: 54155K23
Ships in 1 day
$ 4.99 USD
Free Shipping on orders $49 and up

Hose Clamp 2 5/16" - 3 1/4"

Ensure secure hose connections with the Hose Clamp 2 5/16" - 3 1/4", a versatile and reliable solution for various applications. Crafted from durable materials, this clamp offers superior strength and corrosion resistance. Its adjustable design allows for a snug fit, reducing the risk of leaks and ensuring optimal performance. Upgrade your hose connections with the precision and reliability of the Hose Clamp 2 5/16" - 3 1/4".

  • Versatile and reliable solution for various applications
  • Superior strength and corrosion resistance
  • Adjustable design for a snug fit
  • Reduces risk of leaks for optimal performance
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Genuine BMW - Corporate Logo
T#:55209926
Part#: 0071199KT
Ships in 1 day
New Item
$ 8.59 USD
Free Shipping on orders $49 and up
This Genuine BMW water pump installation hardware kit is the exact factory refresh package needed to maintain the structural integrity of your cooling system's plumbing.
Genuine BMW - Corporate Logo
T#:360658
Part#: 11511714519
Ships in 1 day
$ 19.99 USD
Free Shipping on orders $49 and up
Brand new OEM seal from BMW for your vehicles water pump.


Genuine BMW - Corporate Logo
T#:48194754
Part#: ZS54WPTKT
Ships in 1 day
$ 1,167.99 USD
Free Shipping on orders $49 and up
It is important that your coolant system is serviced at regular intervals to ensure a long life. Over time, coolant systems are exposed to high temperatures and repeated thermal cycling, which causes warping, cracking, and hardening of plastics and rubber components in the coolant system. This can lead to coolant leaks and overheating, which can result in extensive engine damage if not resolved in a timely manner. This Water Pump & Thermostat kit helps to address a few of the most problematic parts, replacing these items entirely to keep your cooling system running optimally and efficiently.
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Victor Reinz - Corporate Logo
T#:580584
Part#: C32348
Ships in 1-3 days
$ 3.99

This product was last offered at the strikethrough price on
05-07-2026

$ 2.99 USD
Free Shipping on orders $49 and up
$ 2.99 USD
Free Shipping on orders $49 and up
Burgaflex - Corporate Logo
T#:57725183
Part#: 11531247261
Ships in 4 Business Days
New Item
$ 10.99 USD
Free Shipping on orders $49 and up
Engineered to meet rigorous standards, this heavy-duty radiator hose provides the durability needed to handle demanding driving conditions.

Genuine BMW - Corporate Logo
T#:152627
Part#: 64548391748
Ships in 6 Business Days
$ 34.99 USD
Free Shipping on orders $49 and up
Genuine BMW INTERMEDIATE RING

CTA Tools - Corporate Logo
T#:641679
Part#: CTAA195
In Stock
$ 9.98 USD
Free Shipping on orders $49 and up
Tests all ethylene glycol solutions with radiator hot or cold
Gates - Corporate Logo
T#:401921
Part#: 11531708499
Ships on Oct 15, 2026
$ 39.99 USD
Free Shipping on orders $49 and up
New upper radiator hose for your BMW

Gates - Corporate Logo
T#:385314
Part#: 11531436988
Ships on Oct 15, 2026
$ 37.99 USD
Free Shipping on orders $49 and up
Serves as a supply line to the radiator
Hepu - Corporate Logo
T#:582854
Part#: 11510393338
Ships on Oct 20, 2026
$ 51.99 USD
Free Shipping on orders $49 and up
Includes O-ring

Burgaflex - Corporate Logo
T#:57725184
Part#: 11537502525
Ships on Oct 20, 2026
New Item
$ 64.99 USD
Free Shipping on orders $49 and up
When you demand dependable thermal management and uncompromised engine cooling performance, the Burgaflex water pipe delivers.

Elring Thermostat O-Ring - BMW S54 3.2L
2X Entries Into Our F80 M3 Sweepstakes
Elring - Corporate Logo
T#:45278657
Part#: 293.300
Special Order: No Guaranteed ETA
$ 3.99 USD
Free Shipping on orders $49 and up
Seals the thermostat and thermostat housing to the water pump Replaces BMW # 11531318402
Elring Thermostat Gasket - BMW M44 1.9L
2X Entries Into Our F80 M3 Sweepstakes
Elring - Corporate Logo
T#:45244504
Part#: 743.390
Special Order: No Guaranteed ETA
$ 7.99 USD
Free Shipping on orders $49 and up
This gasket prevents the coolant from leaking between the thermostat housing and the engine connection. If your gasket is cracked, replace it with this Elring gasket to prevent further coolant leaks.
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Bremmen Parts - Corporate Logo
T#:640149
Part#: 11521712058
In Stock
Sale - Save 22% $ 23.99

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

$ 18.76 USD
Free Shipping on orders $49 and up
Sale - Save 22%
$ 23.99

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

$ 18.76 USD
Free Shipping on orders $49 and up
This fan is driven by the serpentine 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 pieces. Be sure to get a new fan clutch, while you are replacing this.
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2 Pin Connector
10X Entries Into Our F80 M3 Sweepstakes
ECS - Corporate Logo
T#:33412932
Part#: 61132359999
In Stock
Sale - Save 25% $ 10.99

This product was last offered at the strikethrough price on
06-14-2026

$ 8.24 USD
Free Shipping on orders $49 and up
Sale - Save 25%
$ 10.99

This product was last offered at the strikethrough price on
06-14-2026

$ 8.24 USD
Free Shipping on orders $49 and up

Includes connector housing with terminals and seals. Commonly used for the coolant level sensor.

ECS Tuning replacement harness connectors include all necessary pins and wire seals for a complete harness repair. Whether you have a broken harness connector or need a complete wiring repair, we have the components you need.

Each connector includes an additional terminal in case one becomes lost or damaged during installation.

*OEM cross reference PN# 61132359999 - Commonly used for the coolant level sensor.

Please reference the original part number from the existing connector to confirm fitment, before ordering.

Suggested tools:

Suggested crimping pliers: T#387193
Wire De-pin tools:
12pc De-Pin Tool Set - T#386379
23pc De-Pin Tool Set - T#641943

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Bav Auto Temperature Sensor - BMW E39 E46 E9X E60 F01/02
10X Entries Into Our F80 M3 Sweepstakes
Bavarian Autosport - Corporate Logo
T#:639833
Part#: 13621433076
In Stock
Sale - Save 20% $ 14.99

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

$ 11.99 USD
Free Shipping on orders $49 and up
Sale - Save 20%
$ 14.99

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

$ 11.99 USD
Free Shipping on orders $49 and up
This is the coolant temperature sensor used in many BMW models from the late-1990s to the mid-2010s. 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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Radiator Fan Clutch
10X Entries Into Our F80 M3 Sweepstakes
Bremmen Parts - Corporate Logo
T#:57304041
Part#: 11527831619
Ships on Dec 29, 2026
New Item
$ 75.99 USD
Free Shipping on orders $49 and up

Coolant Temperature Sensor
For vehicles with production date up to 09/1998
5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!
Meyle - Corporate Logo
T#:594615
Part#: 13621703993
Ships on Oct 13, 2026
$ 18.99 USD
Free Shipping on orders $49 and up
$ 18.99 USD
Free Shipping on orders $49 and up
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.

This coolant temp sensor fits the following BMWs:
1996-1999 E36 BMW 323is 323ic 328i 328is 328ic M3, located in cylinder head
1999-2003 E39 BMW 540i, located on side of water pump
1999-2001 E38 BMW 740i 740il, located on side of water pump
1995-1996 E38 BMW 750il, located on side of water pump
1990-1999 E31 BMW 850i 850ci, located on side of water pump
2000-2006 E53 BMW X5 3.0i, located in cylinder head
2000-2006 E53 BMW X5 4.4i/4.6is/4.8is, located on side of water pump
1997-2002 Z3 BMW Z3 2.5i Z3 3.0i, located in cylinder head
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Meistersatz - Corporate Logo
T#:379740
Part#: 13621433076
In Stock at Vendor
$ 15.99 USD
Free Shipping on orders $49 and up
Monitors coolant / oil temperature
Coolant Expansion Tank With Cap - 17111712835
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:46616014
Part#: EPK0012
Back Ordered
$ 29.99 USD
Free Shipping on orders $49 and up
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
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:592886
Part#: 11511714519
Back Ordered
$ 9.17 USD
Free Shipping on orders $49 and up
MTC - Corporate Logo
T#:361005
Part#: 17111178412
Back Ordered
$ 2.03 USD
Free Shipping on orders $49 and up
This is the small lower rubber mount that goes on the bottom of the radiator. These mounts sit down into mount 17111723337. Fits left or right side - priced each