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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.

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Bav Auto Thermostat With Aluminum Housing - M52TU M54

T#:12544802

Part#: 11531437040

In Stock

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05-03-2026

$ 84.99 USD

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The plastic thermostat cover in your BMW is a known point of failure. Throughout years of repeated contact with hot coolant, the plastic can crack and cause massive coolant leaks and potential overheating. Eliminate one of the weak links in your cooling system with a replacement aluminum thermostat housing. By installing this aluminum unit, you have no worries as far as plastic housing cracks go

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Bav Auto Coolant Expansion Tank - E36 E39 Z3 M50 M52 S50 S52 ...

T#:638094

Part#: 17111723520

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05-03-2026

$ 31.99 USD

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Replace your old expansion tank to prevent potential failure or leaks. Includes a brand new coolant level sensor. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Bav Auto Water Pump - BMW N54 N55

T#:637476

Part#: 11517632426

In Stock

Sale - Save 17% $ 397.99

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

$ 330.99 USD

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Water pumps are a critical component of your cooling system. A failed water pump will stop the flow of coolant in your vehicle, leading to overheating and eventual engine damage. Replace your faulty or aging water pump with a high-quality Bav Auto unit. Replacement for BMW part # 11517632426 and 11517563659. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Bav Auto Coolant Expansion Tank - E53 X5, E46, E83 X3

T#:640496

Part#: 17137787039

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Sale - Save 18% $ 61.99

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$ 50.99 USD

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We have found that the expansion tanks should be replaced based on age as well as condition. Expansion tanks seem to have a lifespan of less than six years before they show signs of fatigue and wear. Pre-emptively replacing the expansion tank as part of an overall maintenance plan can prevent you from getting stranded from a sudden failure later on. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Bav Auto Heater Inlet Pipe - E46 E39 E53 E83 E85 Z3

T#:638080

Part#: 11531705210

In Stock

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05-03-2026

$ 32.79 USD

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This is the plastic heater inlet pipe that connects the cylinder head to the heater inlet on cars with the M52 or M54 engine. The plastic on this hose becomes brittle over time and eventually leads to failure. Replace yours with a brand new Bav Auto Heater inlet pipe to prevent catastrophic failure.

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Water Pump - N52 3.0L

T#:599823

Part#: 11517586925

In Stock

Sale - Save 10% $ 299.99

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

$ 269.99 USD

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$ 269.99 USD

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Don't take your car's cooling system for granted. A waterpump failure can cost you an engine, which is why preventatively replacing your BMWs waterpump and refreshing the cooling system every 60,000 miles. The water pump is a weak point is the cooling system. Replacing your waterpump will go a long way for keeping your car on the road and operating properly. This water pump fits many 2006 and newer BMW 6 cylinder engines, specifically all the BMWs with the N51, N52, N53 engines. You will also need to purchase replacement aluminum screws Part #11510392553 From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty. This water pump fits the following BMWs: 2008-20xx E82 128i 2006-2006 E90 325i sedan, 330i sedan, 325xi sedan, 330xi sedan 2007-2012 E90 328i sedan, 328xi sedan, 328i xDrive sedan 2007-2012 E92 328i coupe, 328xi coupe, 328i xDrive coupe 2007-2012 E93 328i Convertible 2006-2006 E60 525i, 525xi, 530i, 530xi 2007-2010 E60 528i, 528xi, 528i xDrive 2007-2010 E83 X3 3.0i X3 3.0si 2007-20xx E70 X5 3.0si X5 xDrive30i 2006-2008 E85 Z4 3.0si 2009-20xx E89 Z4 sDrive30i

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Bav Auto Expansion Tank Mounting Plate - E46 Non-M w/ Manual Trans ...

T#:638088

Part#: 17111436250

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$ 35.99 USD

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This Bav Auto part is the mounting bracket from the radiator to the expansion tank on an E46 3 series with a Manual Transmission. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Bavarian Autosport Water Pipe - E46 E39 Z4 Z3 (M52TU, M54)

T#:638085

Part#: 11537502525

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$ 40.79 USD

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This plastic water pipe is positioned directly underneath your intake manifold. Due to its plastic construction, it is notorious for catastrophic failure. Rapid cooling loss and overheating are both direct results of this failure, posing permanent and lasting damage to the engine.

Replace your cracked/broken coolant pipe with this high-quality Bavarian Autosport component to ensure long-term reliability and perfect fitment.

From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Thermostat Assembly

T#:15511823

Part#: 11537598865

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$ 70.19 USD

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Replace your thermostat housing at any signs of leaks or premature failure. Includes housing. Does not include a housing gasket.

URO Coolant Expansion Tank - E30 325e 325i 88-91

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

T#:2453609

Part#: 17111712641

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$ 46.99 USD

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This coolant reservoir is for the E30 325i 1988-1991. We have found that the expansion tanks should be replaced based on age as well as condition. This item fits the following BMWs: 1988-1991 E30 BMW 325e 325es 325i 325ic 325is 325ix

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BMW N47 N55 Expansion Tank

T#:17704781

Part#: 17137642160

In Stock

Sale - Save 20% $ 98.99

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$ 79.19 USD

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BMW N47 N55 Expansion Tank from Turner Motorsport is a high-quality replacement designed to address issues with cracked or damaged coolant expansion tanks. Engineered for durability and performance, this expansion tank ensures reliable cooling system function.

Durable Construction: Built to withstand high temperatures and pressure, ensuring long-term reliability.
Direct Replacement: Engineered as a precise fit for BMW N47 and N55 engines, making installation straightforward and hassle-free.
Enhanced Cooling Efficiency: Maintains optimal coolant levels and pressure for effective engine cooling.
High-Quality Materials: Manufactured from premium materials to resist cracking and leaks.

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BMW N20 2.0L Thermostat With Housing

T#:18003828

Part#: 11538635689

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Sale - Save 20% $ 67.99

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$ 54.39 USD

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BMW N20 2.0L Thermostat With Housing ensures optimal engine performance by maintaining the correct operating temperature. This crucial component regulates coolant flow, preventing issues related to overheating or inadequate cooling. The thermostat plays a vital role in your BMW’s temperature gauge, influencing engine efficiency and longevity.

Precision Temperature Control: Maintains the engine within the ideal temperature range for optimal performance and efficiency.
Complete Assembly: Includes the thermostat and housing, offering a convenient and comprehensive solution for replacements.
Reliable Operation: Helps prevent common issues such as overheating or running too cool by regulating coolant flow effectively.
Enhanced Engine Life: Ensures the engine operates under ideal conditions, extending its lifespan and improving overall performance.
High-Quality Construction: Designed to meet or exceed OEM specifications, providing durability and reliable performance.

Upgrade your BMW with the N20 2.0L Thermostat With Housing to ensure reliable temperature management and enhanced engine performance.

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Bav Auto Expansion Tank Mounting Plate - E46 Non-M w/ Auto Trans ...

T#:638089

Part#: 17111436251

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$ 36.79 USD

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This Bav Auto part is the mounting bracket from the radiator to the expansion tank on E46 3 series and E85/E86 Z4 with an Automatic Transmission. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Bav Auto Coolant Expansion Tank - BMW E90 335d M57 3.0L

T#:640493

Part#: 17138570079

In Stock

Sale - Save 20% $ 78.99

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05-03-2026

$ 63.19 USD

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Replace your damaged expansion tank to prevent coolant loss or potential overheating issues. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Water Pump - N20 N26

T#:29666093

Part#: 11518635089

In Stock

Sale - Save 20% $ 343.99

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

$ 275.19 USD

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A failing water pump can show early warning signs like coolant leaks or a whining noise from the engine bay—but with electric water pumps, failure can be sudden, often with no warning beyond rapid overheating.

If you suspect your water pump is on its way out, prompt replacement is critical to avoid engine damage. Stay alert to any changes in cooling system performance.

Note: Aluminum mounting bolts are single-use and must be replaced during installation.

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BMW N20 2.0L Turbo Supply Cooling Line

T#:17704760

Part#: 11538663516

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$ 37.59 USD

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BMW N20 2.0L Turbo Supply Cooling Line is a crucial component designed to ensure optimal cooling for the turbocharger in BMW vehicles equipped with the N20 2.0L turbo engine. This high-quality cooling line maintains proper coolant flow to the turbo, preventing overheating and ensuring reliable performance.

Optimal Cooling: Effectively cools the turbocharger to prevent overheating and maintain performance.
Durable Construction: Built with high-quality materials for long-lasting reliability.
Precise Fitment: Designed specifically for BMW N20 2.0L turbo engines.
Enhanced Performance: Helps in sustaining the turbo's efficiency and longevity.
Easy Installation: Direct replacement part for a hassle-free installation.

Maintain the efficiency and longevity of your BMW’s turbocharger with this essential cooling line, designed for superior performance and durability.

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Bav Auto Coolant Expansion Tank - With Level Sensor - E70 X5, E71 X6 ...

T#:638093

Part#: 17138621092

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$ 48.79 USD

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Replace your old expansion tank to prevent potential failure or leaks. Includes a brand new coolant level sensor.

Thermostat With Housing

T#:18003829

Part#: 11517805811

In Stock

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$ 47.19 USD

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URO Water Pump - BMW N52 3.0L

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

T#:39768338

Part#: 11517586925

In Stock

Sale - Save 10% $ 296.99

This product was last offered at the strikethrough price on
07-13-2026

$ 267.29 USD

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If your engine is over heating or you have noticed coolant loss, there is a chance your water pump has failed. This URO replacement is a great option to get your BMW back on the road without breaking the bank.

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Nissens Engine Radiator - Manual - E82, E88, E90, E92, E93, Z4 ...

T#:374220

Part#: 17117558480

In Stock

Sale - Save 12% $ 258.99

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

$ 227.30 USD

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$ 258.99

This product was last offered at the strikethrough price on
04-30-2026

$ 227.30 USD

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Keep your engine cooling properly

Aluminum Water Pump Pulley - 104MM

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

T#:374330

Part#: 11511736910

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This product was last offered at the strikethrough price on
05-14-2026

$ 25.78 USD

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Direct replacement durable aluminum pulley

BMW X3 2011 xDrive 35i RADIATOR

T#:591348

Part#: 17117823568

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This product was last offered at the strikethrough price on
02-17-2026

$ 184.10 USD

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More than likely, you are going to replace the radiator in your vehicle at least once. The joints where the cores meet the end tanks tend to get weak and are the first place to spring a leak. Impacts to the fins themselves can cause holes to form. Corrosion and clogging from the inside can make cooling less than effective and compromise coolant flow. Genuine BMW Radiator - This item fits the following BMW Chassis: F25 X3,F26 X4 Fits BMW Engines including: N20,N55

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E32/34 Radiator Stays

T#:590256

Part#: E34RS-1

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This product was last offered at the strikethrough price on
05-15-2026

$ 52.73 USD

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These radiator stays are constructed from 6061 Aluminum and are finished in Black to blend into your engine bay. Each stay is a two-piece assembly that clamps onto the core support. This radiator stay upgrade also includes stainless steel hardware required for installation.

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Bav Auto Coolant Temperature Sensor - M52/S52, M62, M73, M54, S62 ...

T#:639828

Part#: 13621703993

Ships on Oct 16, 2026

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$ 16.79 USD

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This is the coolant temperature sensor used in many BMW models from the mid-1990s to the mid-2000s. The engine computer relies on the coolant temp to set the fuel mapping for the engine. As the car warms up the computer changes the fuel mixture. If your car is running a bit rich (too much fuel) it could be because this sensor is failing and not sending the correct info to the computer. This sensor is located in a variety of places depending on the engine. But it's one of those easy replacement items 'while you're in there' when doing a water pump or thermostat replacement. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Bav Auto Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3 X5 Z4 ...

T#:640208

Part#: 17117639022

In Stock

Sale - Save 15% $ 13.99

This product was last offered at the strikethrough price on
06-03-2026

$ 11.89 USD

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This radiator expansion tank cap is used most BMW's from 1991-2006. It is a common failure item. When this item fails, it cannot hold pressure which results in your BMW overheating. If you are overhauling your coolant system, now is the time to consider preventative replacing this cap. It is also referred to as the coolant reservoir cap. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Bav Auto Coolant Level Sensor - BMW E36 E39 M50/52 S50/52

T#:639793

Part#: 61318360855

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$ 16.99 USD

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This is the sensor / sending unit that notifies the computer if your coolant level is low. When this fails, it can give a false indication of low coolant -- or worse, not inform you of a low coolant situation that could potentially cause overheating. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Water Connection Pipe

T#:15511839

Part#: 17111707817

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05-03-2026

$ 15.19 USD

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$ 18.99

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Connects the radiator to the expansion tank

URO Turbo Coolant Return Line - BMW Gen1 B58 3.0L

T#:53079363

Part#: 11538666857

Ships in 2 Business Days

Sale - Save 5% $ 65.99

This product was last offered at the strikethrough price on
05-26-2026

$ 62.69 USD

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05-26-2026

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Replacement coolant return hose running from the turbocharger to the auxiliary water pump.

Bav Auto Temperature Sensor - BMW E39 E46 E9X E60 F01/02

T#:639833

Part#: 13621433076

In Stock

Sale - Save 20% $ 14.99

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05-03-2026

$ 11.99 USD

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This is the coolant temperature sensor used in many BMW models from the late-1990s to the mid-2010s. The engine computer relies on the coolant temp to set the fuel mapping for the engine. As the car warms up the computer changes the fuel mixture. If your car is running a bit rich (too much fuel) it could be because this sensor is failing and not sending the correct info to the computer. This sensor is located in a variety of places depending on the engine. But it's one of those easy replacement items 'while you're in there' when doing a water pump or thermostat replacement. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Bav Auto Coolant Expansion Tank - E60 E61 E63 E64 M54 N52 N62 ...

T#:640491

Part#: 17137542986

Special Order: No Guaranteed ETA

Sale - Save 10% $ 54.99

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

$ 49.49 USD

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$ 49.49 USD

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This Bav Auto cooling system expansion tank/coolant reservoir is a direct replacement for the factory unit. Replace your cracked or leaking radiator expansion tank today. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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