Find Parts That Fit Your Vehicle

Home
Cooling

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.

Sub-Categories

Sort By:

OEM Wahler Thermostat With Housing - E46 E53 E60 E83 M54

T#:341054

Part#: 11537509227

In Stock

$ 69.99 USD

Add to Wish List

Qty

$ 69.99 USD

Add to Wish List

Stop leaks before they start with this new Thermostat With Housing from Wahler. Despite the fact that most BMW models are brilliant, most have common issues that can plague you during your ownership of the car. This part is one of those issues, as they are known to crack over time. This replacement part is perfect stop a crack and possibly a leak before it starts.

Show More Show Less

OEM Wahler 80 Degree Thermostat - E46 M3, MZ3 S54, Z4 M

T#:360524

Part#: 11531318274

In Stock

$ 105.99

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

$ 68.99 USD

Add to Wish List

Qty

$ 68.99 USD

Add to Wish List

Replacement 80* Celcius thermostat for E46 M3, Z3M w S54 engine, Z4M. The thermostat can be replaced on the E46 M3 without removing the water pump. This can save you money if the pump still has life left on it but the thermostat needs to be done now. Symptoms of a bad thermostat include an erratic temp gauge and a fault code. When replacing the thermostat, there are three o-rings that will likely need to be replaced between the thermostat and the water pump housing, and two on the coolant tube going to the head. We also recommend new hoses, clamps, and BMW coolant. Replacement should take about one hour.

Show More Show Less

Wahler Thermostat Assembly - BMW N55 3.0L

T#:39261790

Part#: 11537598865

In Stock

$ 147.93 USD

Add to Wish List

Qty

$ 147.93 USD

Add to Wish List

BMW N55 3.0L Thermostat Assembly is an essential component for maintaining optimal engine temperature in your BMW, ensuring reliable performance and longevity. A common source of cracks and leaks, the thermostat assembly plays a critical role in regulating coolant flow. This high-quality replacement from Turner Motorsport is designed to meet or exceed OEM standards, providing a dependable solution to prevent overheating and maintain your engine's efficiency.

Show More Show Less

OEM Wahler Thermostat Assembly - E60/61 E82/88 E9X Z4 N51/N52 ...

T#:360363

Part#: 11537549476

In Stock

Sale - Save 7% $ 97.91

This product was last offered at the strikethrough price on
03-25-2026

$ 91.43 USD

Add to Wish List

Qty

Sale - Save 7%

$ 97.91

This product was last offered at the strikethrough price on
03-25-2026

$ 91.43 USD

Add to Wish List

If your vehicle is experiencing cooling issues, chances are the thermostat is the cause. Common symptoms include a prolonged warm-up at highway speeds from the thermostat being stuck open, or consistent overheating issues from the thermostat being stuck in the closed position. Either condition can result in poor performance and potential damage to vital components in your vehicle.

Show More Show Less

Thermostat - 80C

T#:594831

Part#: 11531713040

In Stock at Vendor

$ 49.61 USD

Add to Wish List

Qty

$ 49.61 USD

Add to Wish List

Wahler Thermostat - 105C

T#:369356

Part#: 11537586885

In Stock

$ 72.99 USD

Add to Wish List

Qty

$ 72.99 USD

Add to Wish List

Includes housing and sealing o-ring

OEM Wahler Thermostat - E82 E9X E84 E70 E71 with N55 engines ...

T#:14602

Part#: 11537601158

Ships in 1-2 days

$ 121.98

This product was last offered at the strikethrough price on
06-08-2026

$ 100.00 USD

Add to Wish List

Qty

$ 100.00 USD

Add to Wish List

Engine running a little hot or is the temp gauge not telling you anything? The thermostat might be the likely problem. Many cooling issues start with the thermostat. This is electronically controlled by the engine computer based on the cooling demands from the engine. And cooling components are working harder than ever. Engine performance is also dependent on temperature - as temperatures rise and pass a certain threshold the engine computer will begin reducing power. Stay on top of your cooling maintenance by replacing critical components preventatively. This replacement thermostat fits many of the N55 6 cylinder engines and is an Wahler part. The thermostat is located along with the water pump on the side of the engine. To gain access for removal you may need to remove the water pump as well. If the water pump is removed you MUST replace its mounting bolts. You can add them from the options below. We also have a bundled package that includes the water pump, mounting screws, connecting hose, and clamps if you want to replace everything together (recommended).

Manufacturing OE-grade replacement cooling parts is Wahler’s specialty. When you need to replace a component in your vehicle’s water system, high grade, and long-lasting parts from Wahler ensure the job is done properly the first time.

This item fits the following BMWs:
2008-2013 E82 BMW 135i 135is 1M Coupe
2013+ E84 BMW X1 xDrive35i
2011 E90 BMW 335i 335xi 335i xDrive - Sedan
2011-2013 E92 BMW 335i 335xi 335i xDrive - Coupe
2011-2013 E93 BMW 335i Convertible
2011-2013 E70 BMW X5 xDrive35i
2011-2013 E71 BMW X6 xDrive35i

Show More Show Less

Aluminum Thermostat Housing Kit - M50

T#:397222

Part#: 14-009

In Stock

$ 56.99

This product was last offered at the strikethrough price on
06-18-2026

$ 52.99 USD

Limited Qty Sale

Add to Wish List

Qty

$ 56.99

This product was last offered at the strikethrough price on
06-18-2026

$ 52.99 USD

Limited Qty Sale

Add to Wish List

Plastic thermostat housing cracked on your M50?

Here are your choices: you can wait for the plastic factory thermostat housing cover to break and cause major overheating. (Even with a new stock cover, it won’t take long.) Or you can install a thoughtfully engineered all-aluminum thermostat housing cover from Active Autowerke and never experience this type of failure again. Currently there is no factory upgraded part to this problem. This is an aluminum extruded part that has all of the openings machine properly to fit like factory; from the mounting bolt holes, the seating of the thermostat to the sealing opening for the ORANGE gasket. Forged to exact factory tolerances, everything fits and this unit is a true easy bolt-on – especially suited for racing or load conditions like heavy traffic, where engine temp can rise rapidly. The housing is guaranteed never to break from overheating or over-tightening, and its CNC machined surface ensures a precise seat.

Unit comes complete with a new ORANGE sealing gasket; a new thermostat is recommended but not included.
For hotter climates, a 71 degree thermostat is recommended over the 82 degree unit.

Anything and everything BMW is the mantra at Active Autowerke. Since 1981 they have been serving the BMW community with custom turbocharger kits to a myriad of other innovative and inspiring performance parts.

Show More Show Less

Thermostat Replacement Kit

T#:374361

Part#: N524TSTKT1

In Stock

$ 112.99

This product was last offered at the strikethrough price on
03-26-2026

$ 111.99 USD

Add to Wish List

Qty

$ 111.99 USD

Add to Wish List

Wahler Thermostat - 88ï¿½C - E30, E34, E36, Z3

T#:369466

Part#: 11537511580

In Stock

$ 52.99

This product was last offered at the strikethrough price on
06-19-2026

$ 51.99 USD

Add to Wish List

Qty

$ 51.99 USD

Add to Wish List

Common point of failure in the cooling system.

Active Autowerke Sport Fan Clutch - E36 E46

T#:397219

Part#: 14-010

Ships in 2 Business Days

5% off MSRP $ 259.00

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

$ 246.99 USD

Add to Wish List

Qty

5% off MSRP

$ 259.00

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

$ 246.99 USD

Add to Wish List

When you push your powerplant, thermodynamics push right back. The toll of high performance is higher heat load – and many stock components begin to complain. But Active Autowerke has you covered - this upgraded fan clutch increases viscous coupling of cooling fan blade speed to water pump speed, yielding increased airflow through the radiator for more efficient cooling. A simple, yet wonderful, thing.

This product fits the following BMWs:
1992-1999 E36 323i 325i 328i 330i M3
1998-2006 E46 323i 325i 328i 330i M3

Show More Show Less

Thermostat

T#:1211191

Part#: 11518601366

In Stock

$ 65.99 USD

Add to Wish List

Qty

$ 65.99 USD

Add to Wish List

Wahler Thermostat - E70, E71

T#:362194

Part#: 11537550172

In Stock

$ 109.92

This product was last offered at the strikethrough price on
06-18-2026

$ 90.99 USD

Add to Wish List

Qty

$ 90.99 USD

Add to Wish List

Replaces failed thermostat or as preventative maintenance for your cooling system

Thermostat - MINI Cooper S R52 R53

T#:2257

Part#: 11531485847

In Stock

52% off MSRP $ 43.68

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

$ 20.99 USD

Add to Wish List

Qty

52% off MSRP

$ 43.68

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

$ 20.99 USD

Add to Wish List

Don't take chances! Proper maintenance is required to keep your MINI performing at peak levels. The thermostat basically controls when your car will overheat. This thermostat fits MINI Cooper S R52 R53 with supercharged engine.

Manufacturing OE-grade replacement cooling parts is Wahler’s specialty. When you need to replace a component in your vehicle’s water system, high grade, and long-lasting parts from Wahler ensure the job is done properly the first time.

This item fits the following BMWs:
2002-2006 R53 MINI MINI Cooper S
2003-2007 E52 MINI MINI Cooper S Convertible

Show More Show Less

Active Autowerke Thermostat Bypass/Delete Tube - S65

T#:2302749

Part#: 14-016

Ships in 10 Business Days

$ 141.99 USD

Add to Wish List

Qty

$ 141.99 USD

Add to Wish List

CNC machined coolant/water thermostat bypass tube to improve flow on and off the track. Easy plug and play installation and a durable anodized coating make this a simple and reliable temperature control solution.

Show More Show Less

Thermostat - 80°C

T#:375224

Part#: 11531466174

Ships on Aug 12, 2026

$ 30.99 USD

Add to Wish List

Qty

$ 30.99 USD

Add to Wish List

Wahler Auxiliary Thermostat - E34, E36

T#:375968

Part#: 13541730682

Back Ordered

$ 66.99 USD

Add to Wish List

Qty

$ 66.99 USD

Add to Wish List

Thermostat that controls water flow temperature to the throttle body

Wahler Thermostat - E31, E32

T#:579650

Part#: 4516.85

Back Ordered

$ 34.99 USD

Add to Wish List

Qty

$ 34.99 USD

Add to Wish List

Stop your overheating problem.

Wahler Thermostat O-Ring - E46, Z3, Z4

T#:362366

Part#: 11531318402

Ships in 1 Business Day

$ 6.17 USD

Add to Wish List

Qty

$ 6.17 USD

Add to Wish List

BMW does not include a o-ring with their new thermostats

Wahler Performance Thermostat - 75*C - M42, M50, M52, S50, S52 ...

T#:54388511

Part#: 11537511580

In Stock at Vendor

$ 59.99 USD

Add to Wish List

Qty

$ 59.99 USD

Add to Wish List

75°C variant is specifically calibrated for track racing, forced-induction builds, or hot-climate competitive environments

Active Autowerke Cnc Aftercooler Cooling Kit - F8x S55

T#:5886968

Part#: 15-012

Ships in 3 Business Days

$ 2,849.99 USD

Add to Wish List

Qty

$ 2,849.99 USD

Add to Wish List

BMW's S55 motor is a modern marvel but one weak point, which Active identified is the entire cooling system for the intake which comprises the charge pipe, the aftercooler and the heat exchanger (or radiator). Finally there is a S55 aftercooler kit upgrade that is good enough to carry the Active Autowerke brand. Years of success in developing cars for motorsport has allowed Active to leverage its expertise to the top-mount charge air cooler on the F80 M3, F82 M4 and F87 M2 Competition. This aftercooler was made for the S55 and crafted using only high-grade aluminum to outperform the factory aftercooler in all situations from everyday driving to the toughest racing. The factory cooler was built to support a specific power target and environment. Many of you have increased the performance of the S55 which quickly overwhelms the stock cooler leading to heat soak and higher intake air temperatures which triggers the ECU to downgrade the performance until cooler air returns. Active's focus was not on a mass-market aesthetic add-on but a properly engineered improvement over the existing hardware. Active uses a tube-and-fin core designed specifically for the S55 and included turbulators to maximize the cooling efficiency in as small a package as possible. The end tanks are billet machined aluminum, not cast, folded, or bonded and ensure even distribution of the water throughout the internal aftercooler cores. High precision fittings, CNC machining, and TIG welding throughout ensures the highest quality construction to prevent pressure loss, and the lowest weight, in a bolt-on replacement. But Active also didn’t leave the aesthetics by the wayside as we dip the visible top of the aftercooler in a carbon fiber coating giving your installed cooling system a decidedly top market look to match the improved cooling performance. The Active silicone charge pipes for the F80 M3, F82/F83 M4 and the F87 M2 Competition improve the flow over the stock, compressed plastic pipes. The Active Silicone Charge Pipes allow you to maximize power on your F8X by securing all the boost that your S55 is making. These pipes replace the hot-side pipes leaving the turbos and into the top-mount aftercooler. The stock S55 charge pipes are notorious for developing hairline fractures at their plastic seams. These fractures or cracks are unnoticeable to the naked eye, but under boost pressure they open up leaking the desired charged air into the engine bay, and consequently can rob your S55 of it's full power potential. In addition, these leaks can trigger your S55's turbochargers to work harder to hit and maintain target boost pressure, potentially wearing them out sooner. Active uses silicone in this area because it will not contribute to heat soak and it's easier to mold for the correct clearances. Active uses a 5-layer silicone hose with all needed adapters and stainless hose clamps included. It fits perfectly with our CNC’d top-mount cooler.

Show More Show Less

Thermostat Housing

T#:47850791

Part#: 11537586784

Ships on Aug 12, 2026

$ 142.99 USD

Add to Wish List

Qty

$ 142.99 USD

Add to Wish List

Select Vehicle

Purpose

Category

Home

Cooling

Brand

View All Brands

Price

Special Offers

Shipping