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

Clear BMW chassis

Please ensure your correct model is selected

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.

Sub-Categories

Sort By:
Aluminum Thermostat Housing - E34, E36, Z3
Aluminum Thermostat Housing - E34, E36, Z3
Up to production date 09/1998
Bremmen Parts - Corporate Logo
T#:579865
Part#: 54402
Ships in 1-2 days
Sale - Save 22% $ 25.99

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

$ 20.39 USD
Free Shipping on orders $49 and up
Add to Wish List
Sale - Save 22%
$ 25.99

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

$ 20.39 USD
Free Shipping on orders $49 and up
Add to Wish List
The plastic thermostat cover in your BMW is a known point of failure. Throughout the years of repeated contact with hot coolant, the plastic can crack and cause massive coolant leaks and potential overheating.
Show More Show Less
Bav Auto Spill-Proof Coolant / Antifreeze Funnel
Bav Auto Spill-Proof Coolant / Antifreeze Funnel
Bav Auto Tools - Corporate Logo
T#:580395
Part#: B8800082
In Stock
Sale - Save 15% $ 32.99

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

$ 28.04 USD
Free Shipping on orders $49 and up
Add to Wish List
Sale - Save 15%
$ 32.99

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

$ 28.04 USD
Free Shipping on orders $49 and up
Add to Wish List
Multiple adapters include to fit a variety of vehicles.
Bav Auto Fan Clutch Wrench - 32mm
Bav Auto Fan Clutch Wrench - 32mm
Bav Auto Tools - Corporate Logo
T#:580348
Part#: B8800019
In Stock
Sale - Save 20% $ 29.99

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

$ 23.99 USD
Free Shipping on orders $49 and up
Add to Wish List
Sale - Save 20%
$ 29.99

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

$ 23.99 USD
Free Shipping on orders $49 and up
Add to Wish List
Used to remove your fan clutch
Radiator / Cooling System Pressure Tester- Bavarian Autosport
Radiator / Cooling System Pressure Tester- Bavarian Autosport ...
Bav Auto Tools - Corporate Logo
T#:580397
Part#: B8800084
In Stock
Sale - Save 15% $ 146.99

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

$ 124.94 USD
Free Shipping
Add to Wish List
Sale - Save 15%
$ 146.99

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

$ 124.94 USD
Free Shipping
Add to Wish List
Bav Auto Fan Pulley Holder
Bav Auto Fan Pulley Holder
Bav Auto Tools - Corporate Logo
T#:580358
Part#: B8800031
In Stock
Sale - Save 15% $ 23.99

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

$ 20.39 USD
Free Shipping on orders $49 and up
Add to Wish List
Sale - Save 15%
$ 23.99

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

$ 20.39 USD
Free Shipping on orders $49 and up
Add to Wish List
Used to remove your fan clutch
Thermostat With Housing
Thermostat With Housing
Bremmen Parts - Corporate Logo
T#:26494584
Part#: 11537509227
In Stock
Sale - Save 18% $ 60.99

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

$ 49.99 USD
Free Shipping on orders $49 and up
Add to Wish List
Sale - Save 18%
$ 60.99

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

$ 49.99 USD
Free Shipping on orders $49 and up
Add to Wish List
Bav Auto Angled Hose Pinch Plier Set - 2pc
Bav Auto Angled Hose Pinch Plier Set - 2pc
Bav Auto Tools - Corporate Logo
T#:580379
Part#: B8800058
In Stock
Sale - Save 25% $ 32.99

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

$ 24.74 USD
Free Shipping on orders $49 and up
Add to Wish List
Sale - Save 25%
$ 32.99

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

$ 24.74 USD
Free Shipping on orders $49 and up
Add to Wish List
Angled jaws close, creating a complete seal every time you use them - the jaws are offset, making it possible to use in hard-to-reach locations. Made of glass-filled nylon for extra strength. These are perfect for use with brake lines, etc.
Show More Show Less
Cooling Hose
Cooling Hose
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
Free Shipping on orders $49 and up
Add to Wish List
Sale - Save 26%
$ 10.99

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

$ 8.15 USD
Free Shipping on orders $49 and up
Add to Wish List
Radiator Hose - Upper
Radiator Hose - Upper
Bremmen Parts - Corporate Logo
T#:38688897
Part#: 11531708499
Ships on Aug 19, 2026
Sale - Save 24% $ 14.99

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

$ 11.42 USD
Free Shipping on orders $49 and up
Add to Wish List
Sale - Save 24%
$ 14.99

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

$ 11.42 USD
Free Shipping on orders $49 and up
Add to Wish List
Bremmen Coolant Bleeder Screw - BMW E30 E36 E38 E39 E46 E83 E90 Z4
Bremmen Coolant Bleeder Screw - BMW E30 E36 E38 E39 E46 E83 E90 Z4 ...
Bremmen Parts - Corporate Logo
T#:640140
Part#: 17111712788
In Stock
Sale - Save 39% $ 3.99

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

$ 2.44 USD
Free Shipping on orders $49 and up
Add to Wish List
Sale - Save 39%
$ 3.99

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

$ 2.44 USD
Free Shipping on orders $49 and up
Add to Wish List
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.
Bav Auto Coolant Expansion Tank - E53 X5, Z3 2.3 2.5i 2.8 3.0i
Bav Auto Coolant Expansion Tank - E53 X5, Z3 2.3 2.5i 2.8 3.0i ...
Bremmen Parts - Corporate Logo
T#:640497
Part#: 17107514964
In Stock
Sale - Save 16% $ 63.99

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

$ 53.75 USD
Free Shipping on orders $49 and up
Add to Wish List
Sale - Save 16%
$ 63.99

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

$ 53.75 USD
Free Shipping on orders $49 and up
Add to Wish List
This radiator expansion tank is used on E53 X5 4.4i and 4.6is with M62 engine, and Z3 2.3 2.5i 2.8 3.0i from 1999-2002. It is a common failure item as the plastic weakens over time and stress cracks will lead to coolant leaks. We have found that the expansion tanks should be replaced based on age as well as condition. Expansion tanks seem to have a lifespan of less than six years before they show signs of fatigue and wear. Pre-emptively replacing the expansion tank as part of an overall maintenance plan can prevent you from getting stranded from a sudden failure later on. 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.
Show More Show Less
Bremmen Engine Fan Blade - 11 Blades, 420mm - BMW M30 S38 M50 M52 S50 S52 M54 S54 - (NO LONGER AVAILABLE)
Bremmen Engine Fan Blade - 11 Blades, 420mm - BMW M30 S38 M50 M52 S5...
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
Add to Wish List
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
Add to Wish List
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.
Show More Show Less

Select Vehicle

BMW Mini
Clear Vehicle

Purpose

Category

Brand

Price

$
$

Special Offers

Shipping