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BMW Cooling System Parts & Accessories for BMW X6 M S63 4.4L

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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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Genuine BMW Adapter Wire

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T#:39978

Part#: 12517601308

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4% off MSRP $ 49.99

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

$ 47.99 USD

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4% off MSRP

$ 49.99

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

$ 47.99 USD

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Genuine BMW Adapter Wire, Elec. Auxiliary Water Pump -
This item fits the following BMW Chassis:
E71,F15,F16

Fits BMW Engines including:
N63,N63N

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Expansion Tank - E70, E71

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T#:46468

Part#: 17137589526

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6% off MSRP $ 202.99

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

$ 190.99 USD

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6% off MSRP

$ 202.99

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

$ 190.99 USD

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Genuine BMW Expansion Tank
This item fits the following BMW Chassis:
E70 X5M,E71 X6M,E70 X5,E71 X6

Fits BMW Engines including:
S63

Coolant Hose - E70, E71

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T#:46320

Part#: 17127589734

Ships in 7 Business Days

6% off MSRP $ 126.99

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$ 118.99 USD

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6% off MSRP

$ 126.99

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

$ 118.99 USD

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Genuine BMW Coolant Hose
This item fits the following BMW Chassis:
E70 X5M,E71 X6M,E70 X5,E71 X6

Fits BMW Engines including:
S63

O-RING

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T#:580584

Part#: C32348

In Stock

$ 3.99

This product was last offered at the strikethrough price on
05-07-2026

$ 2.99 USD

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$ 2.99 USD

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BMW Blue Auxiliary Coolant Reservoir Cap

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T#:38128029

Part#: 201-0394-BLU

Ships in 10 Business Days

$ 99.99

This product was last offered at the strikethrough price on
01-22-2026

$ 94.99 USD

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$ 94.99 USD

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BMW Blue Auxiliary Coolant Reservoir Cap is the perfect upgrade for BMW owners looking to enhance both the aesthetics and functionality of their engine bay. Unlike generic aftermarket caps that overlook critical pressure regulation, this precision-engineered cap retains the OEM pressure release functionality, ensuring safe and reliable coolant system performance.

Crafted from high-quality billet aluminum, this reservoir cap offers superior durability and resistance to heat and fluids, preventing warping or degradation over time. Unlike adhesive-based cap covers that can loosen or fall off, this cap is a direct replacement for the factory component, providing a secure, high-performance solution.

OEM pressure release functionality – Maintains proper system regulation for optimal coolant performance
Premium billet aluminum construction – Offers enhanced durability and longevity
Direct replacement design – Secure fit without adhesives or modifications
Resistant to heat and fluids – Ensures long-lasting reliability in extreme conditions
Performance-inspired look – Adds a sleek, high-end appearance to your engine bay
Upgraded durability – Prevents cracking, leaks, and premature wear

Upgrade your BMW’s cooling system with the BMW Blue Auxiliary Coolant Reservoir Cap, blending performance, reliability, and premium styling.

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BMW Black Auxiliary Coolant Reservoir Cap

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T#:38128031

Part#: 201-0394-BLK

Ships in 10 Business Days

$ 99.99

This product was last offered at the strikethrough price on
01-22-2026

$ 94.99 USD

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$ 94.99 USD

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BMW Black Auxiliary Coolant Reservoir Cap is the perfect upgrade for BMW owners looking to enhance both the aesthetics and functionality of their engine bay. Unlike generic aftermarket caps that overlook critical pressure regulation, this precision-engineered cap retains the OEM pressure release functionality, ensuring safe and reliable coolant system performance.

Crafted from high-quality billet aluminum, this reservoir cap offers superior durability and resistance to heat and fluids, preventing warping or degradation over time. Unlike adhesive-based cap covers that can loosen or fall off, this cap is a direct replacement for the factory component, providing a secure, high-performance solution.

OEM pressure release functionality – Maintains proper system regulation for optimal coolant performance
Premium billet aluminum construction – Offers enhanced durability and longevity
Direct replacement design – Secure fit without adhesives or modifications
Resistant to heat and fluids – Ensures long-lasting reliability in extreme conditions
Performance-inspired look – Adds a sleek, high-end appearance to your engine bay
Upgraded durability – Prevents cracking, leaks, and premature wear

Upgrade your BMW’s cooling system with the BMW Black Auxiliary Coolant Reservoir Cap, blending performance, reliability, and premium styling.

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Anti-Freeze Tester

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T#:641679

Part#: CTAA195

Ships on Jul 24, 2026

$ 9.98 USD

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$ 9.98 USD

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Tests all ethylene glycol solutions with radiator hot or cold

OE Pierburg Auxiliary Water Pump - E70,E71,F15,F16

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T#:639135

Part#: 64119230233

Ships on Jul 24, 2026

$ 184.99 USD

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$ 184.99 USD

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Genuine BMW Auxiliary Water Pump This item fits the following BMW Chassis: E70 X5M,E71 X6M,E70 X5,E71 X6,F15,F16

Gates Water Valve - E53, E70, E71, F15, F16 , F85, F86

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T#:553629

Part#: 64116910544

Ships on Jul 27, 2026

$ 280.00 USD

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$ 280.00 USD

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With additional water pump

2 Pin Connector

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T#:33412932

Part#: 61132359999

Ships on Jul 28, 2026

Sale - Save 25% $ 10.99

This product was last offered at the strikethrough price on
06-14-2026

$ 8.24 USD

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Sale - Save 25%

$ 10.99

This product was last offered at the strikethrough price on
06-14-2026

$ 8.24 USD

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Includes connector housing with terminals and seals. Commonly used for the coolant level sensor.

ECS Tuning replacement harness connectors include all necessary pins and wire seals for a complete harness repair. Whether you have a broken harness connector or need a complete wiring repair, we have the components you need.

Each connector includes an additional terminal in case one becomes lost or damaged during installation.

*OEM cross reference PN# 61132359999 - Commonly used for the coolant level sensor.

Please reference the original part number from the existing connector to confirm fitment, before ordering.

Suggested tools:

Suggested crimping pliers: T#387193
Wire De-pin tools:
12pc De-Pin Tool Set - T#386379
23pc De-Pin Tool Set - T#641943

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

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T#:639833

Part#: 13621433076

In Stock

Sale - Save 20% $ 14.99

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

$ 11.99 USD

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Sale - Save 20%

$ 14.99

This product was last offered at the strikethrough price on
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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Meyle Coolant Expansion Tank - BMW E70 E71

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T#:35998394

Part#: 17138621092

Special Order: No Guaranteed ETA

$ 85.99 USD

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$ 85.99 USD

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The coolant expansion tank in your vehicle provides extra space for fluid expansion and contraction due to temperature changes. Because it regularly experiences these fluctuations, it can become prone to cracks or breaks over time. To ensure that all coolant remains within the system, it's important to replace the tank if it has been damaged, such as with cracks, broken nipples, or damaged mounting points.

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Auxillary Fan Switch

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T#:4934936

Part#: 3148210000

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$ 18.99 USD

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$ 18.99 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. Also known as the coolant temperature sending unit, comes with related o-ring

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Auxiliary Water Pump

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T#:380532

Part#: 11517566335

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$ 247.99 USD

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$ 247.99 USD

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Fluid Level Sensor

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T#:5973204

Part#: 17117546548

Special Order: No Guaranteed ETA

$ 13.99 USD

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$ 13.99 USD

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MEYLE-ORIGINAL: True to OE fluid level sensor. Used in multiple locations. Wulf Gaertner Autoparts AG manufactures and markets automotive spare parts under its MEYLE brand. Since its foundation in 1958, Wulf Gaertner Autoparts has been an owner-operated, unlisted family business on the aftermarket scene. Since 1995, Wulf Gaertner Autoparts AG has been manufacturing and trading under its MEYLE brand. They pride themselves on top-grade quality-tested spare parts for passenger cars, vans and commercial vehicles. Comparable OE Cross Reference - 17117546548

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Turbocharger Auxiliary Water Pump - BMW E70 X5M, E71 X6M S63 4.4L ...

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T#:25109080

Part#: 11517629917

Special Order: No Guaranteed ETA

$ 104.99 USD

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$ 104.99 USD

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This auxiliary water pump provides coolant to your turbochargers to prevent them from overheating. Failure of this pump could result in damage to your turbos if not addressed immediately.

Meyle Engine Coolant Thermostat - BMW FXX, GXX

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T#:52797701

Part#: 3282280016

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$ 47.99 USD

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$ 47.99 USD

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This MEYLE thermostat ensures your engine stays at the perfect temperature for efficiency and power.

Auxiliary Water Pump

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T#:22064619

Part#: 11517584088

Special Order: No Guaranteed ETA

$ 245.99 USD

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$ 245.99 USD

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Auxiliary Water Pump - This item fits the following BMW Chassis: F06,F10,F12,F13 Fits BMW Engines including: S63N

Meistersatz Temperature Sensor

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T#:379740

Part#: 13621433076

Ships in 4 Business Days

$ 15.99 USD

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$ 15.99 USD

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Monitors coolant / oil temperature

Auxiliary Fan Switch

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

T#:376847

Part#: 13621433077

Back Ordered

$ 10.99 USD

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$ 10.99 USD

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