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BMW Cooling System Parts & Accessories

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 3.2L- 2 CORE- ALSO FIT M COUPE M ROADSTER- E36

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T#:20946747

Part#: RAD3Z398

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$ 152.99 USD

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$ 152.99 USD

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1 piece of 2-row radiator Made of lightweight & long-lasting aluminum material Overall dimension: 24.5" (L) x 2.75" (W) x 18.5" (H) Inlet: 1.5"/ Outlet: 1.5" Provides maximum cooling efficiency

Aluminum 2-Row Performance Radiator - 1998-2002 BMW E36 Z3 M Coupe/Ro...

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T#:14684348

Part#: RAD3-Z398

Ships in 7 Business Days

$ 152.99 USD

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$ 152.99 USD

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Brand new in original box 1 piece of 2-row radiator Made of lightweight & long-lasting aluminum material Overall dimension: 24.5" (L) x 2.75" (W) x 18.5" (H) Inlet: 1.5"/ Outlet: 1.5" Provides maximum cooling efficiency Professional installation is recommended

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Victor Reinz Water Pump Gasket - E53, E60, E63, E64, E65, E66, E70, F...

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T#:19157

Part#: 11517508535

In Stock at Vendor

$ 26.99

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

$ 23.99 USD

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$ 23.99 USD

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PROFILE-GASKET 11517508535 Manufactured by Reinz

Automatic Transmission Cooler - E36 Z3 E34

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T#:2069

Part#: 17201728770

Ships in 1 Business Day

$ 207.15

This product was last offered at the strikethrough price on
05-11-2026

$ 201.97 USD

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$ 201.97 USD

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This transmission fluid/oil cooler fits E36 318i 318is 318ti 323i 323is 325i 325is 328i 328is M3, E34 525i 530i 1993-1995 and Z3 1.9 2.3 2.5i 2.8 3.0i with automatic transmission.

This oil cooler fits the following BMWs:
1992-1998 E36 BMW 318i 318is 318ti 323is 325i 325is 328i 328is M3
1993-1995 E34 BMW 525i 525i Wagon
1994-1995 E34 BMW 530i 530i Wagon
1996-2002 Z3 BMW Z3 1.9 Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0ibr>

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ACM Auxiliary Fan Assembly - Suction - E36, Z3

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T#:371894

Part#: 64508372039

Back Ordered

$ 166.99 USD

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$ 166.99 USD

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Mounted behind the radiator

Victor Reinz Water Pump O-Ring - E34, E36, E39, E46, E53, E60, E83, Z...

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T#:361076

Part#: 11511711484

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$ 2.03 USD

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$ 2.03 USD

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Solve your water pump leak

Victor Reinz Water Hose O-Ring Seal - N52

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T#:388664

Part#: 11517514942

In Stock at Vendor

$ 4.99 USD

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$ 4.99 USD

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Is your water pump hose leaking where the hose connects to the engine? Most likely this seal has failed and needs to be replaced.

Victor Reinz Water Pump O-Ring (Small) - E32, E34, E38, E39

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T#:362401

Part#: 11531710055

Ships in 8 Business Days

$ 2.99 USD

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$ 2.99 USD

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Replace each time to work on your water pump

Mounting Part

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T#:5095677

Part#: 64113422668

In Stock at Vendor

$ 25.99 USD

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$ 25.99 USD

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Water Temperature Sensor

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T#:596874

Part#: 12621288158

Ships in 1-2 days

$ 44.99 USD

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$ 44.99 USD

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M14x1.5 Thread. Your vehicle is equipped with numerous gauges to allow you to have a better idea of what is going on under the hood. By monitoring these gauges, you can prevent premature engine damage due to low oil pressure or high coolant temperatures. If one isn't functional though, you are in the dark as far as that system goes. One of the most vital is coolant temperature. Replace the sensor to get your gauge working properly again.

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ACM Air Conditioning Fan - E39

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T#:374495

Part#: 64548380780

Ships in 1-2 days

$ 229.99

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

$ 223.99 USD

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$ 223.99 USD

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Also known as "pusher fan"

Victor Reinz O-Ring

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T#:388687

Part#: 11537545278

Ships in 3 Business Days

$ 6.11 USD

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$ 6.11 USD

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Seals your cooling system

O-RING

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T#:580584

Part#: C32348

In Stock

$ 3.99

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

$ 2.99 USD

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$ 2.99 USD

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Victor Reinz Water Pump Gasket - E31, E32, E34, E38, E39, E53 ...

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T#:376106

Part#: 11511731372

Ships in 6 Business Days

$ 7.99

This product was last offered at the strikethrough price on
07-06-2026

$ 7.13 USD

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$ 7.13 USD

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Should be replaced each time the water pump is removed

Victor Reinz Coolant Pipe Gasket

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T#:19371

Part#: 11121726721

Back Ordered

$ 3.05 USD

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$ 3.05 USD

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GASKET ASBESTOS FREE 11121726721 Manufactured by Reinz

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