URO BMW Cooling System Parts & Accessories for BMW 3 Series E46 (1999-2005)

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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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Engine Fan - 11 Blades, 420mm - Many 6 Cylinders
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T#:1287
Part#: 11521712058
In Stock
$ 32.19 USD
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This fan is driven by the serpentine belt, engaged by the fan clutch. If you have bad motor mounts, it's quite common for the blades of this fan to make contact with the radiator or radiator shroud, essentially self-destructing the fan into many peices. Be sure to get a new fan clutch, while you are replacing this. 
With more than 4,000 European vehicle replacement parts, URO is no stranger to the market. Superior metal stock and extremely strict quality control are at the forefront of URO’s agenda and it shows as they become the OE supplier for more and more car companies every single day.

This fan fits many 6 cylinder BMWs, including the following:

1989-1994 E32 735i/iL
1991-1995 E34 525i, 535i, M5
1992-1999 E36 3 series with 6 cylinder engine (M3, 325, 328, 323)
1997-2002 Z3 2.3, 2.5, 2.8, 3.0, and MZ3 3.2 (S52)
1997-2003 E39 5 series, 525i, 528i, 530i
1999-2000 E46 3 series 323i/Ci, 328i/Ci
2001-2005 E46 3 series WITH AUTOMATIC TRANSMISSION ONLY
2001-2006 E46 M3 (all):
2001-2006 X5 3.0i
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URO Radiator Fan Clutch
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T#:362006
Part#: 11527505302
In Stock
$ 72.99 USD
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$ 72.99 USD
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Common source of engine overheating
Radiator Fan Clutch
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T#:373088
Part#: 11527831619
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$ 71.83 USD
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Direct replacement

BMW E46 M3 S54 3.2L Water Pump
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T#:378573
Part#: 11517838159
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$ 105.79 USD
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$ 105.79 USD
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Includes sealing gaskets

BMW Water Pump - Remanufactured - 11517527799
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T#:372932
Part#: 11517527799
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$ 42.99 USD
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Features a metal impeller for reliability
BMW E46 Cooling Fan Shroud
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T#:377316
Part#: 17111436259
In Stock
$ 52.89 USD
$ 52.89 USD

BMW E46 Cooling Fan Shroud is essential for maximizing airflow through your radiator, ensuring optimal engine cooling. This shroud is designed to create the most efficient pull of air, keeping your engine temperature under control, especially during demanding driving conditions.

  • Enhanced Cooling Efficiency: Maximizes airflow through the radiator, ensuring your engine stays cool.
  • High-Quality Construction: Manufactured by URO Parts, a leading brand known for producing reliable and durable replacement components.
  • Precision Fit: Designed specifically for the BMW E46, ensuring a perfect fit and easy installation.
  • ISO 9000 Certified: Built to meet ISO 9000 certification standards for long-lasting performance and reliability.
  • Trusted by Enthusiasts: URO Parts is a trusted name in the automotive industry, offering components that deliver OEM-like performance.

Upgrade your BMW E46 with this Cooling Fan Shroud from Turner Motorsport to enhance your vehicle’s cooling system and maintain peak performance.

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URO Auxiliary Cooling Fan Assembly
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T#:377306
Part#: 17117561757
In Stock
$ 217.99 USD
$ 217.99 USD
The auxiliary fan in your vehicle serves an extremely important role. When your car reaches temperatures that may be hazardous to your engine, the auxiliary fan moves air through the radiator to provide better cooling. Usually activated during times of stationary vehicle operation, it supplements the air usually driven through the radiator by driving down the road. If your vehicle is getting too hot during traffic or at stop lights, your auxiliary fans are probably faulty. Replace yours with this piece from ACM to restore the factory cooling in your vehicle and prevent catastrophic damage to your engine. Even if your fans are still operational but the blades are damaged or cracked, replacement is the only solution.
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URO Coolant Expansion Tank - BMW E46 M3
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T#:48608189
Part#: 17112283344
In Stock
New Item
$ 155.99 USD
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​This radiator coolant reservoir/expansion tank for E46 M3 is a common failure item as the plastic weakens and cracks, causing coolant leaks. If your E46 M3 has over 80k miles and still has the original expansion tank, we highly recommend replacing it during your next major service.
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Coolant Expansion Tank - E53 E46 E83 M52 M54
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T#:373103
Part#: 17137787039
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$ 45.99 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.
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URO - Heater Inlet Pipe - E46, Z3, E39
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T#:34080697
Part#: 11531705210
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$ 34.49 USD
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This runs from the front left side of the cylinder head under the intake manifold toward the firewall.
URO Auxiliary Pusher Fan Assembly - With Frame - E46
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T#:592701
Part#: 64546988913
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$ 202.99 USD
$ 202.99 USD
The auxiliary fan in your vehicle serves an extremely important role. When your car reaches temperatures that may be hazardous to your engine, the auxiliary fan moves air through the radiator to provide better cooling. Usually activated during times of stationary vehicle operation, it supplements the air usually driven through the radiator by driving down the road. If your vehicle is getting too hot during traffic or at stop lights, your auxiliary fans are probably faulty. Replace yours with this piece to restore the factory cooling in your vehicle and prevent catastrophic damage to your engine. Even if your fans are still operational but the blades are damaged or cracked, replacement is the only solution.
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URO Expansion Tank Hose - Heater Core To Expansion Tank - BMW E46 M52...
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T#:43750239
Part#: 64218376153
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$ 29.99 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. With the proper diameter, bends, and lengths, this is the perfect replacement for any swelled or damaged hose. An easy installation, it's piece of mind the next time you are on a long trip or your morning commute.
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Expansion Tank Retaining Plate
For vehicles with automatic transmission only
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T#:362912
Part#: 17111436251
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$ 53.99 USD
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$ 53.99 USD
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Mounts to the side of the radiator for retaining the expansion tank
Expansion Tank Mounting Plate
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T#:584756
Part#: 17111436250
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$ 49.99 USD
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Replace your broken mounting plate to keep your expansion tank secure and prevent leaks.
URO Water Distribution Pipe - E46
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T#:578992
Part#: 17111707817U
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$ 27.99

This product was last offered at the strikethrough price on
04-15-2026

$ 22.99 USD
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$ 22.99 USD
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Plastic 3-way flange that brings together lower radiator hose-expansion hose-bypass hose.

Radiator Drain Plug
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T#:380524
Part#: 17111437361
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$ 3.99 USD
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Usually stripped out after being removed

URO Parts Thermostat Assembly - 11537509227
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T#:29466801
Part#: 11537509227
In Stock
$ 41.99 USD
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$ 41.99 USD
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The thermostat cover in your BMW, made from plastic, is notorious for failing. After years of exposure to hot coolant, the plastic can crack, leading to significant coolant leaks and potential engine overheating.

URO Parts offers a superior solution with their high-quality thermostat cover, designed to surpass the durability of the original factory part. This replacement thermostat comes complete with a gasket for an effortless service.

Features:

Perfect Fit: Guaranteed fitment ensures a seamless replacement process. Optimal Cooling: High-flow OE-style design ensures efficient engine cooling performance. Easy Installation: Manufactured to factory housing dimensions for straightforward bolt-on installation and secure hose connections. Comprehensive Design: Includes ports for temperature sensors where applicable. Superior Materials: Constructed from high-quality alloy or composite materials that resist temperature-induced warping or cracking, preventing coolant leaks. URO Parts, with over 8,000 premium spare parts, specializes in manufacturing precise, durable replacements for factory BMW components. Committed to the highest standards of precision, materials, and workmanship, each part is rigorously tested to deliver the best combination of durability, functionality, and affordability. For reliable replacement parts that offer great value, choose URO Parts.

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Auxiliary Fan Switch O-Ring
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T#:377077
Part#: 13621433077S
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$ 0.88 USD
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Now you can just replace the o-ring instead of the whole switch

URO Thermostat Housing Gasket - BMW M52TU M54
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T#:639269
Part#: 11537509357
Ships in 1 Business Day
$ 2.99 USD
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Prevent leaks with a brand new thermostat housing gasket from URO
Radiator Drain Plug (Adjustment Screw) - Priced Each
For vehicles with manual transmission only
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T#:593031
Part#: 17111437359
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$ 8.99 USD
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$ 8.99 USD
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This is the drain plug (adjustment screw) for manual transmission equipped cars.

Water Pump O-Ring
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T#:555320
Part#: 11537830709
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$ 2.99 USD
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When it comes time to replace the water pump, be sure to replace all the O-Rings associated with it to ensure that your car stays leak free. If you are experiencing leaking issues, be sure to inspect these rings, as they might have worn down. This is used on the return pipe to the thermostat housing
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Expansion Tank Mounting Clamp
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T#:591954
Part#: 17111707777
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$ 6.99 USD
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Locks the expansion tank into the mounting plate via the large hole in the bottom of the tank
Auxiliary Fan Switch
Mounted in upper radiator hose, controls operation of auxiliary fan Mounted in lower radiator hose, controls operation of auxiliary fan
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T#:376847
Part#: 13621433077
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$ 10.99 USD
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$ 10.99 USD
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Comes with related o-ring
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.


URO Radiator Mounting Bracket - E46 Z4
Right Lower Left 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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