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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FAE Auxiliary Fan Switch 91C - E12, E21, E23, E24, E28, E3, E30, E9 ...
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T#:369371
Part#: 61311364272
Ships in 2 Business Days
$ 26.99

This product was last offered at the strikethrough price on
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$ 20.99 USD
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$ 20.99 USD
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Does not include o-ring
Universal 12" Electric Fan - Black
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Mishimoto - Corporate Logo
T#:378443
Part#: MMFAN12
In Stock at Vendor
$ 93.99 USD
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$ 93.99 USD
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WARNING! Prop 65 may apply to this product. Proposition 65 (Safe Drinking Water and Toxic Enforcement Act of 1968) is a California law that applies to call companies selling products in California. Prop 65 requires any listed chemical present above very low levels that are known to cause cancer, birth defects, or other reproductive harm. For more information about California Prop 65 warning see: www.P65Warnings.ca.gov.
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Spal Electric Fan Harness with Relay
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Spal - Corporate Logo
T#:2181323
Part#: FRH
Ships in 3 Business Days
12% off MSRP $ 112.99

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$ 99.99 USD
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$ 112.99

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$ 99.99 USD
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SPAL® electric fan relay wiring kits are designed to automatically turn on your SPAL® electric fan when the air conditioning is turned on. They can also be used when dual electric fans are installed using one switching device. Features: Makes installation of your new fan a breeze Designed to safely integrate with OEM wiring Feature a waterproof 10/40 amp relay with printed wires for easy installation Harness is designed for 12V systems only Does not included thermo-switch
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419 Pc. Metric Universal O-Ring Assortment
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ATD Tools - Corporate Logo
T#:3657943
Part#: ATD3601
Ships in 1 Business Day
$ 59.99 USD
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Always have extra o-rings

Gear Wrench Angled Hose Clip Pliers
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Gear Wrench - Corporate Logo
T#:387079
Part#: KDT3977
Ships in 1 Business Day
$ 53.99 USD
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This tool is a variation of our popular 3976 Flat Band Hose Clamp Pliers and features 45º jaws with swivel tips to grip at any angle and pliers that latch securely in position.
Genuine BMW Thermostat - 80ºC - E30 318i 1602 2002 2002tii E21 320i ...
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Genuine BMW - Corporate Logo
T#:368855
Part#: 11531253249
Ships in 4 Business Days
4% off MSRP $ 336.99

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$ 324.00 USD
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$ 336.99

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$ 324.00 USD
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Genuine BMW Coolant Temperature Sensor
For vehicles with production date up to 09/1979
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Genuine BMW - Corporate Logo
T#:191592
Part#: 62111268355
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4% off MSRP $ 50.99

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$ 48.99 USD
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$ 50.99

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

Genuine BMW Coolant Flange - E30 318i M10 1.8L E21 320i
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Genuine BMW - Corporate Logo
T#:6878
Part#: 11531261528
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4% off MSRP $ 224.99

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$ 215.99 USD
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$ 224.99

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Genuine BMW ENGINE DIVIDER 11531261528

Fits BMW Engines including:
M10


Coolant Hose
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Genuine BMW - Corporate Logo
T#:360987
Part#: 64211367327
Ships in 6 Business Days
4% off MSRP $ 24.99

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$ 23.99 USD
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$ 24.99

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$ 23.99 USD
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Genuine BMW Heater Core Supply Hose - E21 320i
For vehicles with a production date up to 09/1979
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Genuine BMW - Corporate Logo
T#:11068
Part#: 64211364764
Special Order: No Guaranteed ETA
5% off MSRP $ 61.99

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$ 59.00 USD
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$ 61.99

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$ 59.00 USD
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GENUINE BMW HEATER & A/C HOSE, INLET 64211364764.--

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

--.
Fan Clutch Wrench - 32mm
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CTA Tools - Corporate Logo
T#:641760
Part#: CTAA878
Ships on Jul 21, 2026
$ 23.57 USD
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Use to remove and install Fan Clutch Assemblies when replacing Water Pumps or doing other Engine Services
Fan Shroud - E21
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Genuine BMW - Corporate Logo
T#:22495
Part#: 17111116512
Special Order: No Guaranteed ETA
4% off MSRP $ 108.99

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$ 104.99 USD
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$ 108.99

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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
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Genuine BMW - Corporate Logo
T#:35756
Part#: 11531264718
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3% off MSRP $ 233.99

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$ 227.99 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
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Genuine BMW - Corporate Logo
T#:6897
Part#: 11531266741
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$ 36.99

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$ 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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Febi Thermostat - 71°C - E10, E21, E30
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Febi - Corporate Logo
T#:381782
Part#: 11531253249
Ships on Sep 30, 2026
$ 49.99 USD
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Includes a complete housing

1/2"/12mm Band Hose Clamp - 25-40mm - Priced Each
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ECS - Corporate Logo
T#:385425
Part#: 003402ECS05A-06
In Stock
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$ 3.74 USD
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$ 4.99

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Upgrade Your BMW Maintenance with Stainless Steel Hose Clamps from ECS Tuning

ECS Tuning introduces premium full stainless steel hose clamps, offering superior quality and convenience for your BMW maintenance. Avoid dealership delays and overpricing by choosing from a selection of band widths, ensuring you receive top-quality hose clamps without overpaying.

Key Benefits:

  • Premium full stainless steel hose clamps
  • Various band widths for enhanced convenience
  • High-quality alternative to dealership pricing
  • Readily available stock eliminates waiting time
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Band Hose Clamp | 12-20mm 3/8"/9mm
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ECS - Corporate Logo
T#:304266
Part#: 003402ECS06A-03
In Stock
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$ 3.74 USD
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Secure hoses in your BMW effortlessly with the ECS 3/8" / 9mm Band Hose Clamp (12-20mm). Specifically designed for BMW models, this clamp ensures a snug fit and reliable hold for hoses measuring between 12mm to 20mm. Crafted with durable materials, these clamps provide exceptional resistance against leaks and are ideal for various automotive applications. Upgrade your BMW's hose security with these reliable ECS hose clamps.
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Genuine BMW Isa Screw - 07129905494
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Genuine BMW - Corporate Logo
T#:28891
Part#: 07129905494
Ships in 4 Business Days
5% off MSRP $ 7.74

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$ 7.33 USD
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5% off MSRP
$ 7.74

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$ 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

40-60mm 3/8"/9mm Band Hose Clamp
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ECS - Corporate Logo
T#:341280
Part#: 003402ECS06A-08
In Stock
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$ 2.99 USD
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$ 2.99 USD
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ECS Tuning 304 Stainless Steel Hose Clamps

Revolutionize your car maintenance with ECS Tuning's premium 304 stainless steel hose clamps. Eliminate dealership delays and inflated prices! These German-style clamps utilize T-bolts for hassle-free diameter adjustment. With various band widths available, these durable clamps ensure reliability without the hefty cost. Experience dealership-quality products at affordable rates, exclusively at ECS Tuning.

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Universal 12" Electric Puller Fan - Black
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Spal - Corporate Logo
T#:598797
Part#: 30102029
In Stock
$ 207.99 USD
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$ 207.99 USD
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1328 CFM. High performance puller fan with curved blades. This is a universal fan for applications that require more air flow or for engine compartments that have tight tolerances such as an aftermarket turbo set up that needs more clearance. This fan is universal and you must make it fit your application. It is not a direct bolt on. Made in Italy. Size: 13.25in x 12.5in x 3.5n Airflow (CFM): 1328
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PENTOFROST NF 50/50 Antifreeze / Coolant Prediluted / Premixed - 1 G...
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Pentosin - Corporate Logo
T#:34181293
Part#: 8114308
In Stock
Sale - Save 5% $ 20.99

This product was last offered at the strikethrough price on
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$ 19.94 USD
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Blue G11/G48 Coolant Pre-Mixed 50/50

60-80mm 1/2"/12mm Band Hose Clamp
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ECS - Corporate Logo
T#:377836
Part#: 003402ECS05A-10
In Stock
Sale - Save 25% $ 6.99

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$ 5.24 USD
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$ 6.99

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$ 5.24 USD
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ECS Tuning Stainless Steel Hose Clamps for BMW

Upgrade your BMW's hose clamps with ECS Tuning Stainless Steel Hose Clamps, designed for convenience and durability. Say goodbye to long waits and overpriced dealership clamps. With various band widths available, these stainless steel clamps ensure a secure fit for your vehicle's hoses.

Benefits:

  • Convenient replacement for worn-out hose clamps
  • Made of durable stainless steel for long-lasting performance
  • Available in various band widths for versatile use
  • Affordable alternative to dealership pricing
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Expansion Tank Hose
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URO - Corporate Logo
T#:50066848
Part#: 17121712736
In Stock
New Item
$ 12.79 USD
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Coolant overflow hose designed to route excess coolant to and from the expansion tank, helping regulate system pressure and maintain proper coolant levels. Manufactured for correct fit and flow, it ensures reliable expansion tank operation and leak-free performance.
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Red Line Water Wetter Heat Transfer Agent
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Redline - Corporate Logo
T#:3607
Part#: 1-WW-12Z
In Stock
$ 15.99 USD
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Water Wetter is a unique wetting agent for cooling systems which reduces coolant temperatures by as much as 30*F. This liquid product can be used to provide rust and corrosion protection in plain water for racing engines, which provides much better heat transfer properties than glycol-based antifreeze. Or it can be added to new or used antifreeze to improve the heat transfer of ethylene and propylene glycol systems. Designed for modern aluminum, cast iron, copper, brass, and bronze systems.

We have been using RedLine Oil in our street cars and race cars for years. Hands-down, it is the Number One brand of high performance lubricant for BMWs.
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Schwaben Radiator/ Intercooler Fin Comb
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Schwaben - Corporate Logo
T#:384260
Part#: 015326SCH01A
In Stock
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This product was last offered at the strikethrough price on
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$ 14.99 USD
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Straighten bent fins in heat exchangers like radiators, condensers, and intercoolers obstruct air flow and reduce heat transfer. Paper-thin fins are easily bent, even by slight pressure.
3/8"/9mm Band Hose Clamp - 50-70mm
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ECS - Corporate Logo
T#:341684
Part#: 003402ECS06A-12
In Stock
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$ 5.24 USD
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$ 6.99

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$ 5.24 USD
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Elevate your BMW maintenance with ECS Tuning's 304 stainless steel hose clamps, offering convenience and top-quality performance at an affordable price. Designed with various band widths and German-style T-bolts for adjustable sizing, these hose clamps ensure a secure fit for your specific diameter needs. Skip the dealership wait and excessive pricing; ECS Tuning provides reliable, dealership-quality hose clamps without the premium cost, ensuring your car receives the care it deserves.
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Rein Expansion Tank Hose - E12, E21, E23, E24, E28, E30, E32, E34 ...
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Rein - Corporate Logo
T#:19431
Part#: 17121712736
Ships in 1-2 days
Sale - Save 5% $ 13.99

This product was last offered at the strikethrough price on
06-29-2026

$ 13.29 USD
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$ 13.99

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VENT HOSE 17121712736 Manufactured by CRP


Genuine BMW Hose Clamp 07129952104
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Genuine BMW - Corporate Logo
T#:6533
Part#: 07129952104
In Stock
$ 3.99 USD
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GENUINE BMW HOSE CLAMP 07129952104

BMW Antifreeze Coolant - 1 Liter Bottle
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Genuine BMW - Corporate Logo
T#:11526
Part#: 82142209769
In Stock
$ 10.60

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$ 10.49 USD
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$ 10.49 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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Mishimoto Universal Fan Mount Kit
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Mishimoto - Corporate Logo
T#:363171
Part#: MMFANMOUNT
In Stock
$ 15.99 USD
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The Mishimoto universal fan mount kit is used to mount a Mishimoto electric fan to any Mishimoto aluminum radiator. Great for custom applications, the Mishimoto fan can be mounted in any convenient position on the radiator. Universal fan mount fits any Mishimoto electric fan Ideal for custom applications Mounts fan in any convenient position Mishimoto Lifetime Warranty
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Red Line Water Wetter Coolant Additive
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Redline - Corporate Logo
T#:394769
Part#: REDLINE5A
In Stock
Starting at $ 15.99 USD
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Starting at $ 15.99 USD
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Water Wetter is a unique wetting agent for cooling systems which reduces coolant temperatures by as much as 30*F. This liquid product can be used to provide rust and corrosion protection in plain water for racing engines, which provides much better heat transfer properties than glycol-based antifreeze.
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90-110mm 3/8"/9mm Band Hose Clamp
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ECS - Corporate Logo
T#:341281
Part#: 003402ECS06A-13
In Stock
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$ 4.19 USD
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ECS Tuning 304 Stainless Steel Hose Clamps

Once again, ECS Tuning has found a way to make life easier for working on your car. Need new hose clamps but don't want to wait to order it from the dealership or pay more than you should for a hose clamp? That's where we come in! These are full 304 stainless steel hose clamps with various band widths for your convenience. They are German style using T-bolts to adjust in size to your required diameter. Never pay dealer pricing again, but still get the quality you love here at ECS Tuning.

  • Made from high-quality 304 stainless steel for durability
  • German-style design with T-bolts allows for easy size adjustment
  • Various band widths for versatile use
  • Avoid dealership pricing without compromising on quality
  • Perfect for BMW enthusiasts seeking affordable yet reliable hose clamps
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77-85mm - 3/4" Band Hose Clamp
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ECS - Corporate Logo
T#:377877
Part#: 003402ECS07A-05
In Stock
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$ 19.49 USD
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Upgrade your BMW's hose clamps with the 77-85mm - 3/4" Band Hose Clamp from Turner Motorsport. These full 304 stainless steel clamps offer convenience and quality without the dealership price tag. German-style T-bolts allow for easy adjustment to your required diameter, ensuring a secure fit every time.

  • Made of durable 304 stainless steel for long-lasting performance
  • German-style T-bolt design for easy size adjustment
  • Convenient band widths for versatile applications
  • Quality alternative to dealership pricing
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70-90mm 3/8"/9mm Band Hose Clamp
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ECS - Corporate Logo
T#:363017
Part#: 003402ECS06A-11
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$ 5.24 USD
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Upgrade your BMW with ECS Tuning's Stainless Steel Hose Clamps, designed for convenience and durability. With various band widths and German-style T-bolts, these clamps offer easy adjustment to your required diameter. Say goodbye to dealer pricing and enjoy the quality you love at ECS Tuning.

  • Full stainless steel construction
  • Various band widths available
  • German-style T-bolts for easy adjustment
  • Convenient solution for hose clamp replacement
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Schwaben 32mm / 36mm Fan Clutch and Oil Filter Cap Open-End Wrench ...
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Schwaben - Corporate Logo
T#:361021
Part#: DO-3236
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Why buy two tools when you can get one that will do many jobs like this open end wrench? It is great for removing and installing the fan clutch and plastic oil filter cap. Also works great for removing and installing the VAN0S solenoid on M50 engine family. Use the same tools the Turner Motorsport tech's use!

Features:

  • Made of Chrome Vanadium Steel for strength
  • 32/36mm open end sides

 

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OEM Rein Radiator Cap - E21 E24 E10 E12 E23 E28
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Rein - Corporate Logo
T#:7395
Part#: 17111100848
In Stock at Vendor
Sale - Save 5% $ 11.99

This product was last offered at the strikethrough price on
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$ 11.39 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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Coolant Hose
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URO - Corporate Logo
T#:591745
Part#: 11531266471
Ships in 1 Business Day
$ 10.99 USD
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From the water pump to the thermostat
CSF Universal Large Single-Pass Oil Cooler - Universal Application ...
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Universal fitment design - modifications may be necessary to run this cooler
CSF - Corporate Logo
T#:53608839
Part#: 8371
Ships in 3 Business Days
New Item
$ 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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16" Fan shroud gasket
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Spal - Corporate Logo
T#:598825
Part#: 30130074
In Stock at Vendor
$ 17.99 USD
Free Shipping on orders $49 and up
Provides .25" stand off from radiator, does not work with high output fans.

OEM Rein Radiator Coolant Cap
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Rein - Corporate Logo
T#:38161716
Part#: 92810625703
Ships in 3 Business Days
Sale - Save 7% $ 11.99

This product was last offered at the strikethrough price on
06-29-2026

$ 11.12 USD
Free Shipping on orders $49 and up
Sale - Save 7%
$ 11.99

This product was last offered at the strikethrough price on
06-29-2026

$ 11.12 USD
Free Shipping on orders $49 and up
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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Water Hose
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URO - Corporate Logo
T#:373139
Part#: 11531266472
Ships in 1 Business Day
$ 1.99 USD
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Return pipe to water pump
Lower Radiator Hose
For vehicles with a production date from 09/1979
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2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!
URO - Corporate Logo
T#:591747
Part#: 11531266956
Ships in 1 Business Day
$ 6.99 USD
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$ 6.99 USD
Free Shipping on orders $49 and up
Attaches from the radiator to the bottom of the thermostat housing

Universal 10" Electric Fan - Black
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Mishimoto - Corporate Logo
T#:378434
Part#: MMFAN10
In Stock at Vendor
$ 88.99 USD
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$ 88.99 USD
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WARNING! Prop 65 may apply to this product. Proposition 65 (Safe Drinking Water and Toxic Enforcement Act of 1968) is a California law that applies to call companies selling products in California. Prop 65 requires any listed chemical present above very low levels that are known to cause cancer, birth defects, or other reproductive harm. For more information about California Prop 65 warning see: www.P65Warnings.ca.gov.
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Radiator Pressure Test kit 14 pc
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ATD Tools - Corporate Logo
T#:3629267
Part#: ATD3300
Ships in 6 Business Days
$ 497.99 USD
Free Shipping
$ 497.99 USD
Free Shipping
Adapters for most European and domestic vehicles

Fan mounting pin - priced each
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Spal - Corporate Logo
T#:598910
Part#: 30130013
In Stock at Vendor
$ 6.99 USD
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Wire pin used to mount electric fan directly to radiator.

Coolant Temperature Sensor
For vehicles with production date up to 09/1979
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URO - Corporate Logo
T#:372927
Part#: 62110788115
Ships in 1 Business Day
$ 5.99 USD
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$ 5.99 USD
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This coolant sensor is located in the coolant system, monitor the temperature for both the gauge and ECU.
Genuine BMW Water Hose - Thermostat to Water Pump Bypass - E10 ...
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Genuine BMW - Corporate Logo
T#:6893
Part#: 11531266471
Ships in 4 Business Days
$ 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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Hose Clamp 2 5/16" - 3 1/4" - priced each
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ECS - Corporate Logo
T#:376806
Part#: 54155K23
Ships in 1-2 days
$ 4.99 USD
Free Shipping on orders $49 and up

Hose Clamp 2 5/16" - 3 1/4"

Ensure secure hose connections with the Hose Clamp 2 5/16" - 3 1/4", a versatile and reliable solution for various applications. Crafted from durable materials, this clamp offers superior strength and corrosion resistance. Its adjustable design allows for a snug fit, reducing the risk of leaks and ensuring optimal performance. Upgrade your hose connections with the precision and reliability of the Hose Clamp 2 5/16" - 3 1/4".

  • Versatile and reliable solution for various applications
  • Superior strength and corrosion resistance
  • Adjustable design for a snug fit
  • Reduces risk of leaks for optimal performance
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FAE Coolant Temperature Sensor
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FAE - Corporate Logo
T#:10784
Part#: 62110788115
Ships in 1-2 days
$ 13.99 USD
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INSTRUMENTS ENGINE COOLANT TEMP SENSOR 62110788115
FAE Temperature Sending Unit - Temperature Gauge (One Prong Spade Typ...
For vehicles with production date up to 09/1979
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
FAE - Corporate Logo
T#:596552
Part#: 62111268355
Ships in 3 Business Days
$ 13.99 USD
Free Shipping on orders $49 and up
$ 13.99 USD
Free Shipping on orders $49 and up