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BMW Cooling System Parts & Accessories for BMW Z Series E85/6 (2003-2008)

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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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OEM Style Hose Clamps

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T#:338927

Part#: HOSE-CLAMPS

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06-13-2026

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Hose clamps for radiator hoses, coolant hoses, vacuum hoses, or intake hoses. These hose clamps are the same style as your OEM hoses with a smooth inside band to prevent cutting into the hose material.

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Thermostat

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T#:15511826

Part#: 11537549476

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05-03-2026

$ 69.99 USD

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Overheating your N52 or N54 engine can be detrimental to the longevity of your engine. We also recommend replacing your hardware 07119903851 x2

Bav Auto Spill-Proof Coolant / Antifreeze Funnel

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T#:580395

Part#: B8800082

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08-19-2026

$ 28.99 USD

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Multiple adapters include to fit a variety of vehicles.

Thermostat With Housing

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T#:26494584

Part#: 11537509227

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Bav Auto Fan Clutch Wrench - 32mm

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T#:580348

Part#: B8800019

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Used to remove your fan clutch

Radiator / Cooling System Pressure Tester- Bavarian Autosport ...

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T#:580397

Part#: B8800084

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$ 124.94 USD

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Bav Auto Fan Pulley Holder

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T#:580358

Part#: B8800031

Ships on Feb 4, 2027

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$ 20.39 USD

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Used to remove your fan clutch

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

T#:51075091

Part#: MMWP-M50-92

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$ 72.99 USD

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

Bav Auto Angled Hose Pinch Plier Set - 2pc

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T#:580379

Part#: B8800058

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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.

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Bremmen Parts Water Pipe Connector - E83, Z4

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T#:1195932

Part#: 17112248409

Ships on Sep 22, 2026

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$ 30.66 USD

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Located underneath the expansion tank

Bremmen Coolant Bleeder Screw - BMW E30 E36 E38 E39 E46 E83 E90 Z4 ...

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T#:640140

Part#: 17111712788

Ships in 8 Business Days

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09-02-2026

$ 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.

Bremmen Parts O-Ring

Found at the flange end of the upper thermostat hose

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T#:399143

Part#: 11537545278

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$ 4.07 USD

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Seals your cooling system

Coolant Inlet Pipe

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T#:36032354

Part#: 11537516414

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$ 9.50 USD

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Bremmen Parts Coolant Hose - E9X N52

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T#:38621425

Part#: 11537521049

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$ 14.68 USD

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Over the years and with exposure to extremely hot coolant, the coolant hoses in your vehicle can take a beating. Being made of reinforced rubber, these hoses can fail in a number of ways. Splitting at a hose clamp, swelling, cracking, and breaking are just a few of the ways this hose can leave you stranded. Replace it at the first sign of wear to keep your coolant in your engine.

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