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BMW Cooling System Parts & Accessories for BMW Z Series E85/6 (2003-2008)

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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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Thermostat Housing Gasket

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T#:367704

Part#: 11537509357

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14% off MSRP $ 9.74

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$ 8.33 USD

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$ 9.74

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$ 8.33 USD

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Needs to be replaced once removed

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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Genuine BMW Water Hose - Z4 N52

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T#:46233

Part#: 17127545277

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5% off MSRP $ 104.99

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$ 99.99 USD

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5% off MSRP

$ 104.99

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$ 99.99 USD

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Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure.

Genuine BMW radiator hoses are always a perfect option when performing maintenance thanks to their high quality and longevity.

This item fits the following BMW Chassis:
E85,E86

Fits BMW Engines including:
N52

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Hose Clamp 2 5/16" - 3 1/4" - priced each

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T#:376806

Part#: 54155K23

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$ 4.99 USD

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Hose Clamp 2 5/16" - 3 1/4"

Ensure secure hose connections with the Hose Clamp 2 5/16" - 3 1/4", a versatile and reliable solution for various applications. Crafted from durable materials, this clamp offers superior strength and corrosion resistance. Its adjustable design allows for a snug fit, reducing the risk of leaks and ensuring optimal performance. Upgrade your hose connections with the precision and reliability of the Hose Clamp 2 5/16" - 3 1/4".

Versatile and reliable solution for various applications
Superior strength and corrosion resistance
Adjustable design for a snug fit
Reduces risk of leaks for optimal performance

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Gneuine BMW Water Pump & Thermostat Kit - BMW Z3 Z4 S54 3.2L ...

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T#:48194754

Part#: ZS54WPTKT

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$ 1,134.99 USD

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$ 1,134.99 USD

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It is important that your coolant system is serviced at regular intervals to ensure a long life. Over time, coolant systems are exposed to high temperatures and repeated thermal cycling, which causes warping, cracking, and hardening of plastics and rubber components in the coolant system. This can lead to coolant leaks and overheating, which can result in extensive engine damage if not resolved in a timely manner. This Water Pump & Thermostat kit helps to address a few of the most problematic parts, replacing these items entirely to keep your cooling system running optimally and efficiently.

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Genuine BMW Manual Transmission Crossmember

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T#:6619759

Part#: 22315A0E6F2

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7% off MSRP $ 585.99

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$ 545.99 USD

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7% off MSRP

$ 585.99

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$ 545.99 USD

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Genuine BMW Gearbox Support - This item fits the following BMW Chassis: E46,E85,E89 Z4

Victor Reinz O-Ring

Found at the flange end of the upper thermostat hose

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T#:388687

Part#: 11537545278

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$ 6.11 USD

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$ 6.11 USD

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Seals your cooling system

Bremmen Parts O-Ring

Found at the flange end of the upper thermostat hose

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T#:399143

Part#: 11537545278

Ships in 1-2 days

Sale - Save 20% $ 5.09

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

$ 4.07 USD

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$ 5.09

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

$ 4.07 USD

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Seals your cooling system

Bracket Pressure Pipe Airconditioner - E39, E53, E82, E88, E90, E91, ...

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T#:152356

Part#: 64538369549

Ships in 3 Business Days

$ 6.99 USD

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$ 6.99 USD

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Genuine BMW Bracket Pressure Pipe Airconditioner
This item fits the following BMW Chassis:
E39 M5,E53 48IS,E39,E53 X5,E82,E85 Z4,E90,E92,E93

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

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T#:639833

Part#: 13621433076

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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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$ 14.99

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$ 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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Genuine BMW Fan Shroud

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T#:22549

Part#: 17427542913

Ships in 7 Business Days

4% off MSRP $ 222.99

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

$ 212.99 USD

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4% off MSRP

$ 222.99

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

$ 212.99 USD

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Genuine BMW Fan Shroud
This item fits the following BMW Chassis:
E85 Z4M,E85 Z4,E86 Z4

Fits BMW Engines including:
M54,S54

Anti-Freeze Tester

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T#:641679

Part#: CTAA195

Ships on Jun 19, 2026

$ 9.98 USD

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Tests all ethylene glycol solutions with radiator hot or cold

BMW Radiator Expansion Tank Pressure Fitting

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Requires the use of a Motive Power Bleeder, sold separately

T#:380462

Part#: 1175

Ships on Jun 26, 2026

$ 24.99 USD

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$ 24.99 USD

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Allows you to check for leaks in the coolant system

Water Pump Bolt

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T#:15478736

Part#: 11 510392553

Ships on Jun 26, 2026

$ 5.99 USD

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Secures the water pump in place.

Bracket - Deflection Pulley - Z4

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T#:33653

Part#: 11287509247

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2% off MSRP $ 40.99

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$ 39.99 USD

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2% off MSRP

$ 40.99

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$ 39.99 USD

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Genuine BMW Bracket, Deflection Pulley -
This item fits the following BMW Chassis:
E85

Fits BMW Engines including:
M54

Elring Coolant Pipe O-Ring Seal - BMW N52 3.0L

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T#:45415209

Part#: 266.480

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$ 2.99 USD

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Seals the connection between the water pump hose and the engine inlet Replaces BMW # 11517514942

Elring Thermostat O-Ring - BMW S54 3.2L

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T#:45278657

Part#: 293.300

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$ 3.99 USD

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$ 3.99 USD

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Seals the thermostat and thermostat housing to the water pump Replaces BMW # 11531318402

Bremmen Parts Coolant Hose - E9X N52

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T#:38621425

Part#: 11537521049

Ships on Jul 6, 2026

Sale - Save 23% $ 18.99

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

$ 14.68 USD

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Sale - Save 23%

$ 18.99

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

$ 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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2 Pin Connector

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T#:33412932

Part#: 61132359999

Ships on Jul 28, 2026

Sale - Save 25% $ 10.99

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05-03-2026

$ 8.24 USD

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$ 10.99

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$ 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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GEBA Electric Water Pump - BMW E82/88 E9X E60 E70 Z4 N52

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T#:36303288

Part#: 11517586925

Special Order: No Guaranteed ETA

$ 312.99 USD

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$ 312.99 USD

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Don't take your car's cooling system for granted. A water pump failure can cost you an engine, which is why preventatively replacing your BMWs water pump and refreshing the cooling system every 60,000 miles. The water pump is a weak point in the cooling system. Replacing your water pump 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, and N53 engines. You will also need to purchase replacement aluminum screws: SEE PART # 11510392553

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Meyle - Coolant Inlet Hose Section for various BMW models

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T#:40478168

Part#: 11537516414

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$ 7.99 USD

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$ 7.99 USD

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This Meyle component offers OEM-level fit and function for hassle-free installation and dependable cooling system performance.

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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Meyle Coolant Hose - BMW N52 3.0L

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T#:35829327

Part#: 11537521049

Special Order: No Guaranteed ETA

$ 19.99 USD

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$ 19.99 USD

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Over time, coolant hoses in your vehicle can deteriorate due to prolonged exposure to high temperatures from the coolant. Made of reinforced rubber, these hoses are prone to issues such as splitting at hose clamps, swelling, cracking, or even breaking, which can leave you stranded. It's important to replace them at the first sign of wear to prevent coolant loss and ensure your engine stays properly cooled.

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URO Coolant Pipe O-Ring - BMW N52 3.0L

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T#:37892133

Part#: 11517514942

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$ 2.09 USD

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$ 2.09 USD

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URO Coolant Pipe O-Ring - BMW N52 3.0L

Engineered to meet OE coolant pipe o-ring dimensions, the URO Coolant Pipe O-Ring ensures easy installation and a perfect fit for BMW N52 3.0L engines. It is designed to resist cooling system heat and antifreeze, providing reliable performance under demanding conditions. Constructed from durable ECD (Electro Chemical Degradation)-resistant EPDM material, it helps prevent electrolysis, extending the lifespan of your cooling system. With a temperature rating of -40º F to 275º F (-40º C to 135º C), this o-ring is built to withstand extreme temperatures. Supported by a 24-month unlimited mileage warranty, it is a dependable solution for maintaining your BMW’s cooling system efficiency.

Key Benefits:

Precision-molded to OE dimensions for easy installation and perfect fit.
Resists cooling system heat and antifreeze for reliable performance.
Durable ECD-resistant EPDM material prevents electrolysis.
Temperature rating of -40º F to 275º F for extreme condition durability.
Includes a 24-month unlimited mileage warranty for peace of mind.
Specifically designed for BMW N52 3.0L engines.

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Radiator Support Bracket

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T#:14122755

Part#: 17117514402

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$ 8.99 USD

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$ 8.99 USD

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Mounts to top of radiator bracket, 2 per vehicle.

Lower Radiator Mount - Priced Each

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T#:361005

Part#: 17111178412

Back Ordered

$ 2.03 USD

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$ 2.03 USD

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This is the small lower rubber mount that goes on the bottom of the radiator. These mounts sit down into mount 17111723337. Fits left or right side - priced each

URO Radiator Mounting Bracket - E46 Z4

Right Lower

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T#:593030

Part#: 17111436264

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$ 9.99 USD

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$ 9.99 USD

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URO Parts is one of the leading manufacturers of high quality direct replacement aftermarket components, covering a wide range of makes and models. All of their replacement parts are manufactured to ISO 9000 certification standards, so you can expect long lasting performance from URO Parts.

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Radiator Drain Plug With Housing

For vehicles with automatic transmission only

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T#:593032

Part#: 17111437360

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$ 10.99 USD

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$ 10.99 USD

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This is the drain plug (adjustment screw) for automatic transmission equipped cars.

Meistersatz Temperature Sensor

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T#:379740

Part#: 13621433076

Back Ordered

$ 15.99 USD

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$ 15.99 USD

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Monitors coolant / oil temperature

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