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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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Behr Radiator - E36

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T#:1196128

Part#: 17111723784

In Stock at Vendor

$ 298.35 USD

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$ 298.35 USD

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Brand new radiator equivalent to OE

Vaico Coolant Overflow Hose - Radiator to Expansion Tank - BMW F01 F0...

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T#:595421

Part#: 17127575428

In Stock at Vendor

$ 82.99

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

$ 80.99 USD

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$ 80.99 USD

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Overflow hoses connect the radiator and the expansion tank to store overflow of coolant. As pressures in the cooling system increase due to coolant temperatures, a valve on the radiator cap permits coolant back into the reservoir to help ease the build-up of pressure and prevent coolant loss. If your hose is leaking or damaged, we recommend swapping it out with this replacement from Vaico.

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Radiator

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T#:591360

Part#: 17111728905

In Stock at Vendor

$ 399.99

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

$ 388.99 USD

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$ 388.99 USD

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Behr Replacement Radiator - More than likely, you are going to replace the radiator in your vehicle at least once. The joints where the cores meet the end tanks tend to get weak and are the first place to spring a leak. Impacts to the fins themselves can cause holes to form. Corrosion and clogging from the inside can make cooling less than effective and compromise coolant flow.

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Hella Radiator - Manual - E34

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T#:363371

Part#: 17111737760

In Stock at Vendor

$ 687.60 USD

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$ 687.60 USD

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Replace your leaking radiator

Behr Radiator - E60, E61, E63, E64

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T#:579569

Part#: 376755591

Back Ordered

$ 267.99 USD

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$ 267.99 USD

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Replace your leaking radiator

Vaico Coolant Hose - Radiator Outlet Hose to Trans Cooler - BMW E38 E...

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T#:595257

Part#: 11531711384

In Stock at Vendor

$ 129.99

This product was last offered at the strikethrough price on
05-08-2026

$ 125.99 USD

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$ 125.99 USD

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This hose connects the radiator outlet hose to the transmission heat exchanger

REMOTE RADIATOR

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T#:33047035

Part#: 17117634565

In Stock at Vendor

$ 156.99

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

$ 151.99 USD

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$ 151.99 USD

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E46 323/325/328/330 Manual, Z4 OEM Behr Radiator

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T#:338021

Part#: 17119071518

In Stock at Vendor

Starting at $ 249.99 USD

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Starting at $ 249.99 USD

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This is a BEHR brand (OEM supplier to BMW) replacement radiator for all 1999-2006 E46 3 series (non-M), including 323i, 323Ci, 328i, 328Ci, 325i, 325Ci, 330i, 330Ci, and Z4 2.5 and 3.0. Compare to BMW list price of $318! Save big, while still getting the highest quality radiator available for your BMW.

This radiator fits the follow BMWs: :
Only for Manual Transmission
1999-5/2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi - Not for cars with M56 engine

2003-2006 E85 BMW Z4 2.5i Z4 3.0i - M54 engine
2006-2008 E85 BMW Z4 M Roadster M Coupe

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Vaico Lower Radiator Hose - BMW Z4 2.5 3.0 M54

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T#:363540

Part#: 17127514405

In Stock at Vendor

$ 96.99

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

$ 93.99 USD

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$ 93.99 USD

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Replace your leaking coolant hose and prevent engine overheating with this replacement Vaico coolant hose.

Vaico Coolant Hose - Trans Cooler to Radiator - BMW E70 X5 N52 N62 ...

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T#:595408

Part#: 17127537101

In Stock at Vendor

$ 57.99

This product was last offered at the strikethrough price on
04-06-2026

$ 55.99 USD

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$ 55.99 USD

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Returns coolant from the transmission heat exchanger to the radiator

Vaico Intercooler Coolant Hose - Auxiliary Water Pump to Expansion Ta...

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T#:595431

Part#: 17127591512

In Stock at Vendor

$ 185.99

This product was last offered at the strikethrough price on
05-08-2026

$ 179.99 USD

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$ 179.99 USD

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Replacement coolant hose that connects the expansion tank to the auxiliary water pump. Replace your old hose to prevent coolant loss and overheating.

Vaico Radiator Return Coolant Hose - BMW E70 X5 35d M57

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T#:21965996

Part#: 17127794153

In Stock at Vendor

$ 245.99

This product was last offered at the strikethrough price on
05-08-2026

$ 238.99 USD

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$ 238.99 USD

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Returns coolant from the engine to the radiator

Behr Radiator Replacement

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For Automatic Vehicles only

T#:591355

Part#: 17117519211

In Stock at Vendor

$ 454.11 USD

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$ 454.11 USD

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Replace your faulty or worn radiator with this factory replacement

Radiator

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T#:594798

Part#: 17117576827

Ships in 1-2 days

$ 415.99 USD

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$ 415.99 USD

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Replacement Radiator from Behr Hella

Radiator

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T#:594801

Part#: 17117570094

Ships on Jul 28, 2026

$ 374.99 USD

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$ 374.99 USD

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More than likely, you are going to replace the radiator in your vehicle at least once. The joints at where the cores meet the ends tend to get weak and are the first place to spring a leak. Impacts to the fins themselves can cause holes to form. Corrosion and clogging from the inside can make it less than effective. Replace your leaking unit with a factory replacement and get that jug of coolant out of your back seat.

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Radiator

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T#:594800

Part#: 17117605644

Ships on Jul 28, 2026

$ 362.99 USD

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$ 362.99 USD

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Replacement Radiator from Behr

Vaico Expansion Tank Coolant Hose - BMW E70 X5 35d M57

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T#:41052807

Part#: 17127808117

Special Order: No Guaranteed ETA

$ 230.99

This product was last offered at the strikethrough price on
04-15-2026

$ 75.99 USD

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$ 75.99 USD

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Connects the lower expansion tank connection to the transmission heat exchanger

Vaico Upper Radiator Coolant Hose - BMW G30 G32 G11/G12 B58A ...

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T#:41188159

Part#: 17128602871

Special Order: No Guaranteed ETA

$ 85.99 USD

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$ 85.99 USD

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Directs coolant from the engine to the radiator. Stop leaks and prevent overheating with a new upper radiator hose.

Behr Radiator - E34

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T#:1195792

Part#: 17111723467

Back Ordered

$ 273.99

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

$ 265.99 USD

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$ 265.99 USD

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OE replacement radiator

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