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BMW Cooling System Parts & Accessories for BMW 3 Series E91 (2006-2012)

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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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Water Pump And Thermostat Kit - BMW N52 3.0L

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T#:17073598

Part#: 11537549476KT

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$ 319.88 USD

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Includes everything you may need to replace your water pump and thermostat.

Cooling System Hose Kit

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T#:24212306

Part#: E9XN52CHKT

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$ 179.95 USD

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Replace your cooling system hoses with this complete kit including coolant

Expansion Tank Replacement Kit

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T#:15744017

Part#: N524ECSTNKKT-KT

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04-17-2026

$ 100.95 USD

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The coolant expansion tank in your vehicle gives additional fluid a place to go after expansion and contraction from temperature change. Because it is subjected to such drastic changes on a regular basis, it can often crack or break. You want to keep all the coolant in your vehicle in the cooling system. If your tank has experienced damage such as cracking, nipples breaking off, or mounting point damage, you will need to replace it. The kit includes: Expansion tank with level sensor URO expansion tank cap Genuine BMW expansion tank grommet Genuine BMW mounting bolts

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Water Pump And Thermostat Kit

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T#:15511872

Part#: 821414677040KT

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09-14-2026

$ 470.81 USD

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$ 635.99

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$ 470.81 USD

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The water pumps in these BMW models are known for failure near 80,000 miles is a very common issue often times leaving the owner stranded. The aftermarket kit offered provides a single stop for water pump and thermostat replacement needs to save the search and get you back on the road. Kit includes: Mahle-Behr thermostat Water pump Genuine BMW coolant Mounting hardware required for both the thermostat and water pump

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Oil Filter Housing Replacement Kit

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T#:57507416

Part#: 11428642283KT4

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$ 361.99 USD

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$ 361.99 USD

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Maintain reliable oiling system performance and prevent catastrophic oil leaks on the street or track with an Oil Filter Housing Replacement Kit. Designed to replace failing or heat-warped factory housings, this complete assembly cures problematic oil leakage while ensuring proper oil flow through your engine's lubrication circuit. Bundled with a fresh oil pressure sensor, factory sealing gaskets, and new mounting hardware, this kit provides a complete overhaul solution to safeguard engine health and ensure precise oil pressure readings under extreme operating conditions.

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Cooling System Service Kit

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T#:57507415

Part#: 11428642283KT3

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$ 458.99 USD

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$ 458.99 USD

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Eliminate common top end oil leaks and fragile plastic cooling components with the ultimate preventive maintenance package for your BMW. Designed for thorough maintenance or prep before track days, this kit pairs a new oil filter housing assembly with fresh gaskets and hardware to restore leak-free oil pressure management. To address vulnerable factory cooling lines, the package includes an upgraded ECS billet aluminum coolant flange, replacing the failure-prone OEM plastic fitting with a permanent metal solution. Bundled with factory Genuine BMW coolant, this service kit delivers peace of mind under extreme driving conditions.

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ECS Cooling System Refresh Kit - Level 2

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T#:15710821

Part#: 17137607482-KT

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Sale - Save 19% $ 912.99

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09-14-2026

$ 740.04 USD

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$ 912.99

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$ 740.04 USD

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As your mileage increases, so does wear and tear on your engine's cooling components. Cooling system components live a rough life, going through extreme temperature changes and being exposed to the elements. A cooling system failure can, and probably will leave you stranded. Included in this kit Water pump with new bolts Thermostat & housing Expansion tank with level sensor Expansion tank cap 1 Gallon of OEM Coolant Waterpump & thermostat hoses Upper and lower radiator hoses Accessory belt

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Thermostat

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T#:15511826

Part#: 11537549476

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$ 69.99 USD

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$ 84.99

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$ 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

Expansion Tank Vent Hose

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T#:30729012

Part#: 17127618510

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$ 29.99 USD

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$ 36.99

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$ 29.99 USD

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Coolant Hose - Priced Each

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T#:30729023

Part#: 17127540020

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09-16-2026

$ 32.29 USD

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$ 37.99

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Radiator Hose - Upper

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T#:38621422

Part#: 17127531579

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$ 30.99 USD

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$ 42.83

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$ 30.99 USD

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Radiator Hose - Lower

Lower

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T#:30729025

Part#: 17127531581

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$ 24.27 USD

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Radiator Hose

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T#:5649971

Part#: 64216951946

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$ 27.12 USD

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Connects from the top side of the radiator to the expansion tank. Often an overlooked maintenance part.

Lower Cooling Hose - 17117524710

For vehicles with automatic transmission only

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T#:36913374

Part#: 17117524710

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$ 29.37 USD

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This hose connects to the lower coolant pipe on the passenger side of vehicles equipped with automatic transmissions.

Coolant Hose Assembly

For manual transmission models only

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T#:30729020

Part#: 17127548223

Ships on Mar 29, 2027

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09-02-2026

$ 106.39 USD

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Radiator Hose - Lower

For N52 engines only

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T#:53008808

Part#: 17127564478

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Coolant Expansion Tank Cap

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T#:36032339

Part#: 17117639020

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$ 11.99 USD

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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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$ 16.14 USD

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Bremmen Auxiliary Fan Temperature Switch - E46 E39 E9X E60 E70 E53 ...

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T#:640141

Part#: 13621433077

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$ 16.79 USD

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The auxiliary fan switch activates the auxiliary cooling fan to provide additional cooling under high heat loads, and when the car is stationary

Water Pipe

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T#:39295542

Part#: 11537545890

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$ 17.33 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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