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BMW Cooling System Parts & Accessories for BMW 1 Series

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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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Mahle-Behr Coolant Expansion Tank - E82/88 Z4 E9X N52 N54 3.0L ...

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T#:350824

Part#: 17137640514

Ships in 1 Business Day

$ 142.99

This product was last offered at the strikethrough price on
02-20-2026

$ 130.99 USD

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$ 130.99 USD

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Upgrade your BMW's cooling system with the Turner Motorsport Mahle Coolant Expansion Tank. This essential component provides additional space for coolant expansion and contraction, ensuring optimal performance in varying temperatures. Designed to withstand drastic temperature changes, this expansion tank prevents coolant leaks and maintains proper coolant levels in your vehicle. Replace your damaged tank to keep your BMW's cooling system running smoothly.

Key Benefits:

Prevents coolant leaks and loss
Ensures proper coolant expansion and contraction
Durable construction for long-lasting performance
Direct replacement for damaged tanks
Compatible with various BMW models

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OEM Mahle-Behr Thermostat - E82 E9X E60 X3 Z4 with N52 N54 engines ...

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T#:341203

Part#: 11537549476

In Stock at Vendor

$ 135.19 USD

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$ 135.19 USD

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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 N51 N52 N53 N54 6 cylinder engines and is an OEM Behr 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).

This thermostat fits the following BMWs:
2008+ E82 BMW 128i 135i
2007+ E9X BMW 325i 325xi 328i 328xi 330i 335i 335xi
2006+ E60 BMW 525i 525xi 528i 528xi 530i 530xi 535i 535xi
2006+ X3 BMW X3 3.0i X3 3.0si
2006+ Z4 BMW Z4 3.0i Z4 3.0si

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E82 128i, E9X 325/328/330 Automatic OEM Behr Radiator

For vehicles with Automatic Transmissions only

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T#:341215

Part#: 17117562079

In Stock

$ 278.00

This product was last offered at the strikethrough price on
03-13-2026

$ 187.99 USD

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$ 187.99 USD

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This is a RADIATOR for BMW 3 series with the N52/N52N engine (3.0 liter naturally aspirated) from 2006 to 2009 WITH AUTOMATIC TRANSMISSION. Hailing from Stuttgart, Mahle-Behr specializes in automotive cooling systems. From air conditioning to engine cooling M-B has you covered with OE-quality replacement parts.

Hailing from Stuttgart, Mahle-Behr specializes in automotive cooling systems. From air conditioning to engine cooling M-B has you covered with OE-quality replacement parts.

This part fits the following BMWs
2008+ E82 BMW 128i N52
2006-2011 E90 BMW 325i 325xi 328i 328xi 328i xDrive 330i 330xi N52/N52N- Sedan
2006-2012 E91 BMW 325xi 328i 328xi 328i xDrive N52/N52N - Wagon
2007-2013 E92 BMW 328i 328xi 328i xDrive N52/N52N - Coupe
2007-2013 E93 BMW 328i N52/N52N- Convertible
2009+ Z4 BMW Z4 sDrive30i

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E82 128i, E9X 325i/xi 328i/xi OEM Behr Radiator

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:341214

Part#: 17117559273

In Stock

$ 316.58

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

$ 283.99 USD

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$ 283.99 USD

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This is a BEHR brand replacement radiator for E90 325i/xi 328i/xi E92 328i/xi, E93 328i, E28 128i, with N52 or N52N engines Not for cars with N51 SULEV engine. This radiator is made by BEHR, an original equipment supplier to BMW. BEHR radiators are what we use our own BMWs and customer installs. We've found the BEHR radiator has the highest lifespam, least amount of manufacturing defects, and best continued cooling performance. Simply put, you do not want anything else in your BMW but a BEHR brand radiator.

This item fits the following Manual Transmissionl BMWs:
2008+ E82 BMW 128i
2007-2012 E90 BMW 325i 325xi 328i 328xi 328i xDrive - Sedan
2007-2012 E91 BMW 325xi 328i 328xi 328i xDrive - Wagon
2007-2013 E92 BMW 328i 328xi 328i xDrive - Coupe
2007-2013 E93 BMW 328i - Convertible

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BMW M Performance Hose From Radiator Bottom - E82 E92 E93 N54 1 M Cou...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:22536

Part#: 17127602294

Ships in 2 Business Days

10% off MSRP $ 194.99

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

$ 175.99 USD

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10% off MSRP

$ 194.99

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

$ 175.99 USD

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Genuine BMW Hose From Radiator Bottom - Thermostat
This item fits the following BMW Chassis:
E82 1M Coupe,E82,E92,E93

Fits BMW Engines including:
N54T

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E82 135i, E89 Z4 28i/35i, E9X 335i/xi Automatic OEM BMW Radiator ...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:341263

Part#: 17117547059

In Stock

$ 377.99 USD

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$ 377.99 USD

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Hailing from Stuttgart, Mahle-Behr specializes in automotive cooling systems. From air conditioning to engine cooling M-B has you covered with OE-quality replacement parts.

BMW M Performance Left Radiator - E82,E92,E93,E82 1M Coupe

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:46042

Part#: 17117602241

Ships in 1-2 days

11% off MSRP $ 315.99

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

$ 281.99 USD

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11% off MSRP

$ 315.99

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

$ 281.99 USD

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This radiator aids in the cooling of you N54 engine which is know for running on the hot side. This is perfect for cars that see track time and spirited driving.

Genuine BMW Left Radiator
This item fits the following BMW Chassis:
E82 1M Coupe,E82,E92,E93

Fits BMW Engines including:
N54

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E82 135i, E89 Z4 28i/35i, E9X 335i/xi Manual OEM Behr Radiator ...

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T#:341223

Part#: 17117558480

Ships in 1-2 days

$ 338.47 USD

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$ 338.47 USD

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This radiator is the OEM direct replacement for the stock radiator in the 135i, 335i, 335xi, and Z4 35i. Keeping your N54 or N55 at peak performance means including your cooling system in your regular maintenance schedules with the radiator, water pump, and thermostat being the primary components needing replacement. Not only can a failed radiator leave you stranded, but the sophisticated engine electronics will limit engine operability if temperatures reach a certain level. So having an efficient and fully functional cooling system is critical not only for safety but for performance as well. Don't wait until it's too late!

Hailing from Stuttgart, Mahle-Behr specializes in automotive cooling systems. From air conditioning to engine cooling M-B has you covered with OE-quality replacement parts.

This item fits the following BMWs with manual transmissions only:
2008-2012 E82 BMW 135i 1M Coupe
2006-2011 E90 BMW 335i 335xi 335i xDrive - Sedan
2007-2013 E92 BMW 335i 335is 335xi 335i xDrive - Coupe
2007-2013 E93 BMW 335i - Convertible
2009+ Z4 BMW Z4 sDrive28i Z4 sDrive35i

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BMW M Performance Cooling Kit - E8X E9X 135i 335i/xi N54 (03/2008+ w/...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:5214

Part#: 11122157665

Ships in 8 Business Days

2% off MSRP $ 1,880.00

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

$ 1,846.99 USD

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2% off MSRP

$ 1,880.00

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

$ 1,846.99 USD

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The N54 engine is prone to running hot. If you want to track your BMW, we highly recommend upgrading your cooling system. One great option is this BMW M Performance Cooling Kit for your 135i and 335i/xi. This kit includes a new fan and fan shroud, new cooling hoses, and an additional coolant radiator for increased cooling! Also included are all the necessary components for installation .

BMW Performance Power Kit
Fits BMW Engines including:
N54

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