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BMW Cooling System Parts & Accessories for BMW E21 320i M10 1.8L

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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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BMW Antifreeze Coolant - 1 Gallon

T#:1474

Part#: 82141467704

In Stock

6% off MSRP $ 28.29

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 26.63 USD

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6% off MSRP

$ 28.29

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 26.63 USD

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The use of Original BMW Anti-Freeze/Coolant will ensure sufficient cooling in summer and protection against freeze-ups in winter. BMW Antifreeze/Coolant will also guard your vehicle's various engine components against corrosion.

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Achilles Motorsport OBD1-to-OBD2 Coolant Hose Adapter - BMW M52 S52 E...

For models with a OBD2 24v Swap (M5X, S5X engines) only!

T#:1150775

Part#: 11-AM-CHCAP-OBD1

In Stock

$ 54.99 USD

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$ 54.99 USD

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OBD2 to OBD1 Conversion Coolant Hose Adapter for E36 M52 & S52 Engines Replaces the metal pipe from the OBD2 engines with a hose adapter that allows the installation of a normal OBD1 coolant hose. This is useful when converting an OBD2 Engine to OBD1, or when swapping OBD2 engines into a car that is originally OBD1 (like an E30). The simple kit comes complete with the necessary 2 O-rings, extended bolt, Nylon Lock Nut & washers to make this a quick install. No need to wait! It is also completely reversible!

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Bav Auto Spill-Proof Coolant / Antifreeze Funnel

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

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$ 32.99

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

$ 28.04 USD

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Multiple adapters include to fit a variety of vehicles.

Race German Coolant Temperature Sender Adapter - M12x1.5

T#:6827887

Part#: RGCTSAM12

Ships in 3 Business Days

$ 35.99 USD

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$ 35.99 USD

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Race German has devoted themselves to providing quality products for late model BMWs that cover both street and track applications. Race German has now grown their catalog to a wide variety of models and products geared towards keeping your car looking and running nice. For those looking to install an aftermarket coolant temp gauge, Race German has the perfect accessory for you! This adapter is machined out of aluminum and splices into your upper radiator hose. Perfect for use with Race German's E30 temperature gauge but has compatibility with a wire variety of other cars as well! Features: Tapped for M12x1.5 sized sensor 38mm diameter outlets which fit most BMW hoses Includes 2x hose clamps **Does not include temp sensor

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Bav Auto Fan Clutch Wrench - 32mm

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

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Sale - Save 20%

$ 29.99

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

$ 23.99 USD

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Used to remove your fan clutch

Race German Coolant Temperature Sender Adapter - 1/8NPT

T#:6827888

Part#: RGCTSA1/8NPT

In Stock

$ 35.99 USD

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$ 35.99 USD

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Race German has devoted themselves to providing quality products for late model BMWs that cover both street and track applications. Race German has now grown their catalog to a wide variety of models and products geared towards keeping your car looking and running nice. For those looking to install an aftermarket coolant temp gauge, Race German has the perfect accessory for you! This adapter is machined out of aluminum and splices into your upper radiator hose. Perfect for use with Race German's E30 temperature gauge but has compatibility with a wire variety of other cars as well! Features: Tapped for 1/8NPT sized sensor 38mm diameter outlets which fit most BMW hoses Includes 2x hose clamps **Does not include temp sensor

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

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

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Sale - Save 15%

$ 146.99

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

$ 124.94 USD

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Bav Auto Fan Pulley Holder

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

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$ 23.99

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

$ 20.39 USD

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Used to remove your fan clutch

Genuine BMW Temperature Sensor - E21 320i E28 524td

For vehicles with a production date from 09/1979

T#:40756

Part#: 12631279721

In Stock

Sale - Save 6% $ 44.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 42.27 USD

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$ 44.99

This product was last offered at the strikethrough price on
06-25-2026

$ 42.27 USD

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Genuine BMW Temperature Switch - 17Cel

Fits BMW Engines including:
M10

Trunk Tool Kit Water Pump Pliers - E36 E46 E30 E39

T#:11239

Part#: 71111179522

Ships in 3 Business Days

4% off MSRP $ 47.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 45.99 USD

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4% off MSRP

$ 47.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 45.99 USD

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Missing a tool from your trunk mounted tool kit? Replace your missing water pump pliers with this Genuine BMW part. Having a complete tool kit is handy for quick repairs or it can save you in case of roadside failures. Also a complete tool kitis must when selling a car. If the tool kit is missing parts, what else has been neglected on the car?

This item fits the following BMWs:
1970-1976 2002 BMW 1600 2002 2002tii
1977-1983 E21 BMW 320i
1984-1991 E30 BMW 318i 318is 318ic 325e 325es 325i 325ic 325is 325ix M3
1992-1998 E36 BMW 318i 318is 318ti 318ic 323is 323ic 325i 325is 325ic 328i 328is 328ic M3
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi M3
1976-1978 E12 BMW 530i
1982-1988 E28 BMW 528e
1989-1995 E34 BMW 525i 530i 535i 540i M5
1997-2003 E39 BMW 525i 528i 530i 540i M5
1988-1994 E32 BMW 735i 735il 740i 740il 750il
1995-2001 E38 BMW 740i 740il 750il
1990-1999 E31 BMW 840i 840ci 850i 850ci 850csi
1996-2000 Z3 BMW M Roadster M Coupe
2000-2003 E52 BMW Z8 Roadster

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Genuine BMW Auxiliary Fan Switch – 91°C

T#:368494

Part#: 61311364272

Ships in 5 Business Days

3% off MSRP $ 75.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 73.99 USD

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3% off MSRP

$ 75.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 73.99 USD

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Bav Auto Angled Hose Pinch Plier Set - 2pc

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

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Sale - Save 25%

$ 32.99

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

$ 24.74 USD

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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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Genuine BMW Coolant hose - E34 535i

T#:367918

Part#: 17121712736

In Stock

Sale - Save 5% $ 76.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 72.94 USD

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$ 76.99

This product was last offered at the strikethrough price on
06-25-2026

$ 72.94 USD

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Genuine BMW Thermostat - 80ºC - E30 318i 1602 2002 2002tii E21 320i ...

T#:368855

Part#: 11531253249

Ships in 4 Business Days

3% off MSRP $ 336.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 326.99 USD

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3% off MSRP

$ 336.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 326.99 USD

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Genuine BMW Coolant Flange - E30 318i M10 1.8L E21 320i

T#:6878

Part#: 11531261528

Ships in 4 Business Days

3% off MSRP $ 224.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 217.99 USD

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3% off MSRP

$ 224.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 217.99 USD

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Genuine BMW ENGINE DIVIDER 11531261528

Fits BMW Engines including:
M10

Genuine BMW Coolant Temperature Sensor

For vehicles with production date up to 09/1979

T#:191592

Part#: 62111268355

Ships in 4 Business Days

2% off MSRP $ 50.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 49.99 USD

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2% off MSRP

$ 50.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 49.99 USD

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Genuine BMW Engine Coolant Temp Sensor -
This item fits the following BMW Chassis:
E30

Coolant Hose

T#:360987

Part#: 64211367327

Ships in 6 Business Days

$ 24.99 USD

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$ 24.99 USD

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Genuine BMW Heater Core Supply Hose - E21 320i

For vehicles with a production date up to 09/1979

T#:11068

Part#: 64211364764

Ships in 10 Business Days

3% off MSRP $ 61.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 59.99 USD

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3% off MSRP

$ 61.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 59.99 USD

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GENUINE BMW HEATER & A/C HOSE, INLET 64211364764.--

This item fits the following BMWs:
BMW 3 Series - 320i

--.

Fan Shroud - E21

T#:22495

Part#: 17111116512

Ships in 10 Business Days

3% off MSRP $ 108.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 105.99 USD

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3% off MSRP

$ 108.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 105.99 USD

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Genuine BMW FAN SHROUD.--

This item fits the following BMWs:
BMW 3 Series - 320i

--.

Fits BMW Engines including:
M10

Genuine BMW Return coolant pipe - E21 320i

T#:35756

Part#: 11531264718

Special Order: No Guaranteed ETA

2% off MSRP $ 233.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 228.99 USD

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2% off MSRP

$ 233.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 228.99 USD

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Genuine BMW Return Pipe -

This item fits the following BMW Chassis:
E30

Fits BMW Engines including:
M10

Genuine BMW Coolant hose - E21 320i

T#:6897

Part#: 11531266741

Special Order: No Guaranteed ETA

$ 34.99 USD

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$ 34.99 USD

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Genuine BMW ENGINE WATER HOSE 11531266741.--

This item fits the following BMWs:
BMW 3 Series - 320i

--.

Fits BMW Engines including:
M10

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Genuine BMW Isa Screw - 07129905494

T#:28891

Part#: 07129905494

In Stock

5% off MSRP $ 7.74

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 7.33 USD

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5% off MSRP

$ 7.74

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 7.33 USD

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Genuine water pump hardware. M6x16-8.8. 6 of these screws are found in association with the water pump

BMW Antifreeze Coolant - 1 Liter Bottle

T#:11526

Part#: 82142209769

In Stock

$ 10.60 USD

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$ 10.60 USD

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This 1 liter bottle is perfect for topping of the coolant in your BMW. This is The use of Original BMW Anti-Freeze/Coolant will ensure sufficient cooling in summer and protection against freeze-ups in winter. BMW Antifreeze/Coolant will also guard your vehicle's various engine components against corrosion. BMW Anti-Freeze/ Coolant will prevent excessive silicate gel precipitation, which may cause plugging of the cooling system and lead to more extensive repairs.

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Rein Expansion Tank Hose - E12, E21, E23, E24, E28, E30, E32, E34 ...

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:19431

Part#: 17121712736

In Stock

$ 13.99 USD

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$ 13.99 USD

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VENT HOSE 17121712736 Manufactured by CRP

Genuine BMW Hose Clamp 07129952104

T#:6533

Part#: 07129952104

In Stock

$ 3.99 USD

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$ 3.99 USD

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GENUINE BMW HOSE CLAMP 07129952104

OEM Rein Radiator Coolant Cap

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:38161716

Part#: 92810625703

Ships in 5 Business Days

$ 11.99 USD

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$ 11.99 USD

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Rein Automotive OE Quality caps are designed to be direct replacements for OE caps. Rein caps are designed to match or exceed the OE materials used and are produced to the highest standards to ensure long service life. Rein Automotive OE quality caps keep the coolant system at the proper pressure, just like the OE cap.

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OEM Rein Radiator Cap - E21 E24 E10 E12 E23 E28

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:7395

Part#: 17111100848

In Stock at Vendor

$ 11.99 USD

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$ 11.99 USD

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The radiator tank cap keeps necessary pressure on your coolant to increase efficiency. If you have an overheating issue in your vehicle, a simple, quick, and inexpensive part to replace is this cap. Often times, the coolant is not kept under enough pressure to keep it from boiling or expanding too much. This cap keeps all the heat and liquid inside the coolant system for maximum efficiency. Should be replaced each time major coolant system service is performed.

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Genuine BMW Water Hose - Thermostat to Water Pump Bypass - E10 ...

T#:6893

Part#: 11531266471

Ships in 4 Business Days

$ 11.99 USD

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$ 11.99 USD

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Genuine BMW ENGINE WATER HOSE 11531266471.--

This item fits the following BMWs:
BMW 1600, 2002, 2002tii
BMW 3 Series - 320i

--.

Fits BMW Engines including:
M10

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O-RING

T#:580584

Part#: C32348

Ships in 3 Business Days

$ 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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Water Hose - E21

T#:22307

Part#: 11531266463

Ships in 9 Business Days

$ 14.99 USD

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Qty

$ 14.99 USD

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Genuine BMW WATER HOSE.--

This item fits the following BMWs:
BMW 3 Series - 320i

--.

Fits BMW Engines including:
M10

Water Hose - E21

T#:407578

Part#: 11531266468

Ships in 9 Business Days

$ 14.99 USD

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$ 14.99 USD

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Expansion Tank - E21

T#:44522

Part#: 16121118911

Ships in 9 Business Days

3% off MSRP $ 93.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 90.99 USD

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3% off MSRP

$ 93.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 90.99 USD

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Genuine BMW EXPANSION TANK

Fits BMW Engines including:
M10

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