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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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High Performance Metal Water Pump & Pulley Kit - M54

10X Entries Into Our F80 M3 Sweepstakes

T#:55749612

Part#: 888010330KT3

In Stock

$ 299.99 USD

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$ 299.99 USD

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Oil Filter And Cooler Kit - E36

10X Entries Into Our F80 M3 Sweepstakes

T#:56616386

Part#: E36OILCLRKT

Ships on Sep 22, 2026

$ 1,149.99 USD

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$ 1,149.99 USD

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We’ve curated the ultimate complete retrofit kit that adapts the legendary Euro S50 oil filter housing to your US spec M50, M52, S50, or S52 engine. Featuring an upgraded CSF Euro Spec all-aluminum oil cooler, custom mounting brackets, and all necessary OEM seals, lines, and conversion hardware

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Mishimoto Water Pump - BMW M50, M52, M54, S50, S52

T#:51075091

Part#: MMWP-M50-92

In Stock

$ 72.99 USD

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$ 72.99 USD

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The Mishimoto Performance Water Pump provides the thermal stability required for modified engines.

Mishimoto Thermostat W/ Housing & Sensor - BMW M52, M54, M56 Engines ...

T#:51075086

Part#: MMTS-E46-99E

In Stock

$ 91.99 USD

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$ 91.99 USD

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The Mishimoto Thermostat Assembly focuses on precision fitment and long-term durability.

Wahler Performance Thermostat - 75*C - M42, M50, M52, S50, S52 ...

T#:54388511

Part#: 11537511580

Ships in 2 Business Days

$ 59.99 USD

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$ 59.99 USD

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75°C variant is specifically calibrated for track racing, forced-induction builds, or hot-climate competitive environments

Hex Bolt & Washer Kit

T#:55245856

Part#: 0711990XXKTKT

Ships in 3 Business Days

$ 35.31 USD

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$ 35.31 USD

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Turner Motorsport offers this Genuine BMW Hex Bolt and Washer Kit to keep your chassis maintenance or engine refresh completely up to factory standard.

Water Pump Installation Hardware Kit

T#:55209926

Part#: 0071199KT

In Stock

$ 8.59 USD

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$ 8.59 USD

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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.

CSF Universal Large Single-Pass Oil Cooler - Universal Application ...

2X Entries Into Our F80 M3 Sweepstakes
Universal fitment design - modifications may be necessary to run this cooler

T#:53608839

Part#: 8371

Ships in 4 Business Days

$ 499.00 USD

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$ 499.00 USD

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CSF redesigned this cooler and went with a more traditional inlet/outlet orientation. The new single pass design features high efficiency and high durability, but with vertically oriented inlet and outlet connections.

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Oil Cooler Line O-Ring & Screw Kit

T#:55281750

Part#: 1722OCLKT

Ships in 3 Business Days

$ 20.60 USD

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$ 20.60 USD

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This Genuine BMW Oil Cooler Line O-Ring & Screw Kit includes the exact factory components required to safely service your oil cooler hard lines.

Lower Radiator Mount & Bracket Refresh Kit

T#:55245854

Part#: 1711117XKT

Ships in 3 Business Days

$ 26.92 USD

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$ 26.92 USD

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This Genuine BMW Lower Radiator Mount and Bracket Refresh Kit supplies the factory-original hardware needed to overhaul your lower radiator supports.

Bav Auto Coolant Expansion Tank - E53 X5, Z3 2.3 2.5i 2.8 3.0i ...

10X Entries Into Our F80 M3 Sweepstakes

T#:640497

Part#: 17107514964

In Stock

Sale - Save 50% $ 63.99

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

$ 32.00 USD

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Sale - Save 50%

$ 63.99

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

$ 32.00 USD

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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.

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Radiator Hose - Low

T#:57725183

Part#: 11531247261

Ships on Sep 24, 2026

$ 10.99 USD

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$ 10.99 USD

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Engineered to meet rigorous standards, this heavy-duty radiator hose provides the durability needed to handle demanding driving conditions.

Water Pipe

T#:57725184

Part#: 11537502525

Ships on Sep 29, 2026

$ 64.99 USD

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$ 64.99 USD

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When you demand dependable thermal management and uncompromised engine cooling performance, the Burgaflex water pipe delivers.

Radiator Fan Clutch

10X Entries Into Our F80 M3 Sweepstakes

T#:57304041

Part#: 11527831619

Ships on Dec 29, 2026

$ 75.99 USD

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$ 75.99 USD

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Thermostat - 80°C

10X Entries Into Our F80 M3 Sweepstakes

T#:57507417

Part#: 11531318274

Ships on Jan 6, 2027

$ 59.99 USD

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$ 59.99 USD

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