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BMW Cooling System Parts & Accessories for BMW X Series E53 (2000-2006)

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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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Coolant Expansion Tank - E46 (non-M), X3, X5 3.0

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T#:338020

Part#: 17117573781

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04-01-2026

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This coolant reservoir is for the non-M E46 3-series models from 1999-2006 (M3 takes a different expansion tank). 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. This is the most recent expansion tank design from Hella-Behr, the OEM supplier to BMW. It replaces the original BMW part number 17137787039.

Other items to consider replacing at the same time are the radiator cap, coolant level sensor, lower radiator hose, coolant temp sensor in the lower hose, and the hose clamps. If your car has an automatic transmission you should also replace the oil cooler thermostat in the radiator frame, which is a common source for leaks.

This coolant expansion tank fits:

1999-2006 E46 3 series - 323i, 323Ci, 325i, 325Ci, 325xi, 328i, 328Ci, 330i, 330Ci & 330xi (**no M)
2004-2008 X3 SAV - X3 2.5, X3 3.0, X3 3.0si
2000-2005 X5 SAV - X5 3.0

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Water Pump - E39 540i E38 740i/il E53 X5 4.4i 4.6is

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T#:348558

Part#: 11510393336DK

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Sale - Save 7% $ 192.99

This product was last offered at the strikethrough price on
07-15-2026

Starting at $ 180.03 USD

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$ 192.99

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Starting at $ 180.03 USD

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Don't take your car's cooling system for granted!One of the biggest weak points is 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 BMW 1999-2001 E38 740i/740iL, 1999-2003 E39 540i, 1999-2003 E53 X5 4.4i and 4.6is with M62TU 4.4L (4.6L for the 4.6is) engine.

Choose from a water pump with a metal or composite impeller.
This water pump comes complete with housing profile gasket and o-rings.

This item fits the following BMWs:
1999-2003 E39 BMW 540i 540i touring
1999-2001 E38 BMW 740i 740il
2000-2003 E53 BMW X5 4.4i X5 4.6is
2000-2003 E52 BMW Z8 Alpina

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Basic Cooling System Service Kit - E53 X5 M54 3.0L

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T#:557190

Part#: E53X5M54BCKT

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05-03-2026

$ 392.29 USD

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Just like the rest of your vehicle's major systems, the cooling system must also be addressed periodically to ensure proper cooling and component reliability. Plastic and rubber components become brittle and prone to splitting or cracking after long periods of heating and cooling cycles, especially in colder climates! The coolant itself can degrade or become contaminated, leading to potential corrosion or freezing issues. Finally, thermostats and sensors can fail completely, preventing proper cooling and/or coolant temperature readings to become inaccurate.

To make sure you are not left stranded on the side of the road with an overheated engine, we have put together this Basic Cooling System Service kit. This kit contains all of the most-likely-to-fail components, giving you peace of mind knowing your engine will continue to run cool for another 60,000+ miles.

See kit contents below for all included components.

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E36/E46/Z3/Z4 ECS Tuning Aluminum Water Pump Pulley - Black

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T#:363707

Part#: 001977ECS03A

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06-13-2026

$ 99.74 USD

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Most of the pulleys on your BMW engine are plastic, which become brittle and frail over time and from engine bay heat. A failed pulley could leave you stranded which is why it is vital to inspect the pulleys during routine maintenance. This is an aluminum version of the stock water pump pulley used on the M50/M52/M52TU/M54 engine in the E36, E46, Z3, Z4, and other models. It uses the same hardware and the original belt as the stock plastic pulley. But the aluminum will last much longer.

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Coolant Vacuum Purge & Refill Tool Set

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T#:402498

Part#: 024948SCH01A

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Sale - Save 25% $ 115.99

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05-03-2026

$ 86.99 USD

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The Schwaben Coolant Vacuum Fill Tool ensures no air pockets get into your cooling system while you're replacing your coolant - intended for use to refill your cooling system, not for removal. Can be used with Schwaben fluid extractors or with shop air - standard air compressor with a minimum rating of 90 PSI (6.2 bar). Includes all fittings and adapters necessary for use, with a molded storage case to keep your Schwaben Vacuum Fill Tool pristine for future use.

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Thermostat With Housing - 90C

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T#:598978

Part#: 11531436386

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05-03-2026

$ 75.06 USD

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A thermostat that opens sooner promotes better cooling in your vehicle. Running a lower temperature thermostat will keep everything much cooler. Keeping the engine cooler will help reduce and improve the life of the seals in your engine, saving you time and money, while also help increase engine performance. A tune might be required to gain the most from this modification, as well as to get your car's ECU accustomed to seeing lower temperatures.

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Genuine BMW Thermostat With Housing - M52 M54

T#:360689

Part#: 11537509227

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Sale - Save 8% $ 169.69

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

$ 156.96 USD

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08-26-2026

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Radiator / Cooling System Pressure Tester- Bavarian Autosport ...

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T#:580397

Part#: B8800084

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05-03-2026

$ 124.94 USD

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Water Heater Control Valve

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T#:3018052

Part#: 64116910544

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$ 68.54 USD

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Keep your HVAC system running properly with a new Water Heater Control Valve.

Rein Coolant Expansion Tank - E46, E53, E83

2X Entries Into Our F80 M3 Sweepstakes

T#:402141

Part#: 17117573781

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08-31-2026

$ 72.57 USD

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Includes cap and level sensor

Genuine BMW Water Pump Pulley

T#:4472

Part#: 11511436590

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Sale - Save 7% $ 73.99

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$ 68.99 USD

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08-17-2026

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SEE T#337981

Genuine BMW Water Pipe - E46 325xi 330xi E53 X5 M54 E83 X3 M54 ...

T#:367703

Part#: 11537502000

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Sale - Save 75% $ 221.99

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$ 54.77 USD

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Expansion Tank

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T#:592015

Part#: 17137501959

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$ 71.24 USD

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Includes vent screw and leveling switch

OEM Rein Upper Radiator Hose - E53 X5 M62 4.4L 4.6L

2X Entries Into Our F80 M3 Sweepstakes

T#:379731

Part#: 11537500746

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08-31-2026

$ 61.74 USD

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

This item fits the following BMWs:
2000-2003 E53 BMW X5 4.4i 4.6is

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Rein Lower Radiator Hose - E53 X5 N62 4.4L 4.8L

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T#:362530

Part#: 17127509963

Ships in 3 Business Days

Sale - Save 19% $ 51.38

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04-15-2026

$ 41.79 USD

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

Fits the following BMWs:
2003+ E53 BMW X5 N62 4.4L 4.8L

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Coolant Expansion Tank

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T#:591949

Part#: 17107514964

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This product was last offered at the strikethrough price on
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$ 76.94 USD

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Includes bleeder screw

OEM Rein Upper Radiator Hose - E53 X5 N62 4.4L 4.8L

2X Entries Into Our F80 M3 Sweepstakes

T#:362526

Part#: 17127526856

Back Ordered

Sale - Save 6% $ 83.99

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08-31-2026

$ 79.05 USD

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

Fits the following BMWs:
2003+ E53 BMW X5 N62 4.4L 4.8L

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Thermostat With Housing

2X Entries Into Our F80 M3 Sweepstakes

T#:582356

Part#: 11537509227

Ships in 3 Business Days

Sale - Save 5% $ 89.99

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08-31-2026

$ 85.49 USD

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Stop leaks before they start with this new Thermostat With Housing from Rein.

Expansion Tank Mounting Plate

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T#:591946

Part#: 17101439110

Ships in 3 Business Days

Sale - Save 5% $ 80.99

This product was last offered at the strikethrough price on
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$ 76.94 USD

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Bremmen Parts Auxiliary Water Pump Hose - E53

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T#:1195928

Part#: 11537505949

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Sale - Save 3% $ 110.15

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

$ 106.85 USD

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Used for the additional water pump

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