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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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Water Pump O-Ring

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T#:555320

Part#: 11537830709

In Stock

$ 2.99 USD

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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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E46 323/325/328/330 Manual, Z4 5/05+ OE BMW Radiator

T#:5797

Part#: 17119071517

Ships in 1 day

6% off MSRP $ 487.99

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

$ 459.99 USD

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6% off MSRP

$ 487.99

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

$ 459.99 USD

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This is a Genuine BMW brand replacement radiator for 5/2005-2006 E46 3 series with M54 engine, including 325i, 325Ci, 330i, 330Ci, and Z4 2.5 and 3.0. Save big, while still getting the highest quality radiator available for your BMW.

When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.

This radiator fits the follow BMWs: :
Only for Manual Transmission
5/2005-2006 E46 BMW 325i 325ci 325xi 330i 330ci 330xi- Only for M54 engine
2006-2008 E85 BMW Z4 3.0i Z4 3.0si

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E46 325ci 06 (M56 Engine) OE BMW Radiator

T#:5800

Part#: 17117548432

Ships in 6 Business Days

6% off MSRP $ 648.99

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

$ 610.99 USD

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6% off MSRP

$ 648.99

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

$ 610.99 USD

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This is a Genuine BMW brand replacement radiator for E46 325ci with M56 engine. Save big, while still getting the highest quality radiator available for your BMW.

When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.

This radiator fits the follow BMWs::
Only for Automatic Transmission
2006 E46 BMW 325ci - Only for M56 engine

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Thermostat Housing Gasket

T#:367704

Part#: 11537509357

Ships in 1 day

14% off MSRP $ 9.74

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

$ 8.33 USD

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14% off MSRP

$ 9.74

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

$ 8.33 USD

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Needs to be replaced once removed

Oil Cooler Line O-Ring & Screw Kit

T#:55281750

Part#: 1722OCLKT

Ships in 1 day

$ 20.60 USD

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$ 20.60 USD

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This Genuine BMW Oil Cooler Line O-Ring & Screw Kit includes the exact factory components required to safely service your oil cooler hard lines.

Genuine BMW Manual Transmission Crossmember

T#:6619759

Part#: 22315A0E6F2

Ships in 1 day

4% off MSRP $ 585.99

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

$ 559.99 USD

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4% off MSRP

$ 585.99

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

$ 559.99 USD

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

Genuine BMW - Level 2 Cooling System Refresh Kit + Belts - E46 M52, M...

For vehicles with production date from 09/2002

T#:369667

Part#: ECSE461711-2

Ships in 2 Business Days

$ 1,095.99 USD

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$ 1,095.99 USD

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A Level 2 kit that includes belt service components

Genuine BMW - Level 1 Expansion Tank Replacement Kit - E46 M52,M54 ...

T#:380426

Part#: 17117573781OEKT1

Ships in 1 day

$ 589.99

This product was last offered at the strikethrough price on
07-10-2026

$ 499.99 USD

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$ 499.99 USD

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Water Pump Installation Hardware Kit

T#:55209926

Part#: 0071199KT

Ships in 1 day

$ 8.59 USD

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$ 8.59 USD

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This Genuine BMW water pump installation hardware kit is the exact factory refresh package needed to maintain the structural integrity of your cooling system's plumbing.

Electric Auxiliary Fan - E46 323I 325I 328I 330I

T#:4558

Part#: 64546988913

Ships in 1 day

2% off MSRP $ 938.99

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

$ 915.99 USD

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2% off MSRP

$ 938.99

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

$ 915.99 USD

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This electric auxiliary fan for BMW E46 3 Series mounts in front of the radiator and is designed to push air through the A/C Condenser and main radiator. It provides additional cooling for when the car is in traffic. It is a common failure item. If your engine temps are creeping up or if your A/C isn't blowing cold this could be the cause.

NOTE: This is the fan that mounts in front of the radiator. It is not the electric engine fan that mounts between the radiator and engine.

This item fits the following BMWs:
1999-2006 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi

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O-RING

T#:580584

Part#: C32348

Ships in 1-3 days

$ 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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Bracket - Fan Housing - E46

T#:45829

Part#: 17112282209

Ships in 6 Business Days

$ 13.99 USD

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$ 13.99 USD

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Genuine BMW Bracket, Fan Housing
This item fits the following BMW Chassis:
E46 M3,E46

Fits BMW Engines including:
S54

Water Pipe

T#:57725184

Part#: 11537502525

Ships on Oct 20, 2026

$ 64.99 USD

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$ 64.99 USD

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When you demand dependable thermal management and uncompromised engine cooling performance, the Burgaflex water pipe delivers.

OEM VDO Auxiliary Electric Cooling Fan - E46 323I 325I 328I 330I ...

We Price Match - Give Us A Call or Chat!

T#:3077081

Part#: 64546988913

Special Order: No Guaranteed ETA

$ 314.99 USD

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$ 314.99 USD

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This electric auxiliary fan for BMW E46 3 Series mounts in front of the radiator and is designed to push air through the A/C Condenser and main radiator. It provides additional cooling for when the car is in traffic. It is a common failure item. If your engine temps are creeping up or if your A/C isn't blowing cold this could be the cause. NOTE: This is the fan that mounts in front of the radiator. It is not the electric engine fan that mounts between the radiator and engine. This item fits the following BMWs: 1999-2006 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi

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Elring Thermostat O-Ring - BMW S54 3.2L

2X Entries Into Our F80 M3 Sweepstakes

T#:45278657

Part#: 293.300

Special Order: No Guaranteed ETA

$ 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 Engine Fan Blade - 11 Blades, 420mm - BMW M30 S38 M50 M52 S5...

10X Entries Into Our F80 M3 Sweepstakes

T#:640149

Part#: 11521712058

In Stock

Sale - Save 22% $ 23.99

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

$ 18.76 USD

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Sale - Save 22%

$ 23.99

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

$ 18.76 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 pieces. Be sure to get a new fan clutch, while you are replacing this.

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Coolant Hose With Quick Connectors

We Price Match - Give Us A Call or Chat!

T#:17339415

Part#: 11531436410

Special Order: No Guaranteed ETA

$ 28.99 USD

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$ 28.99 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.

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BMW Coolant Flange

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T#:17339423

Part#: 17111707817

Special Order: No Guaranteed ETA

$ 47.99 USD

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$ 47.99 USD

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Water distribution pipe that connects the expansion tank to the radiator

Radiator Fan Clutch

10X Entries Into Our F80 M3 Sweepstakes

T#:57304041

Part#: 11527831619

Ships on Dec 29, 2026

$ 75.99 USD

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$ 75.99 USD

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Thermostat - 80°C

10X Entries Into Our F80 M3 Sweepstakes

T#:57507417

Part#: 11531318274

Ships on Jan 6, 2027

$ 59.99 USD

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$ 59.99 USD

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Heater Hose

10X Entries Into Our F80 M3 Sweepstakes

T#:38621423

Part#: 64218376999

In Stock

Sale - Save 22% $ 20.99

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

$ 16.31 USD

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Qty

Sale - Save 22%

$ 20.99

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

$ 16.31 USD

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Auxillary Fan Switch

Mounted in upper radiator hose, controls operation of auxiliary fan Mounted in lower radiator hose, controls operation of auxiliary fan

5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

T#:4934936

Part#: 3148210000

Ships on Oct 13, 2026

$ 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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Fluid Level Sensor

5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

T#:5973204

Part#: 17117546548

Ships on Oct 13, 2026

$ 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 - Lower Right E46

5X Entries Into Our F80 M3 Sweepstakes

T#:40478120

Part#: 11531436408

Ships on Oct 13, 2026

$ 32.99 USD

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$ 32.99 USD

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Upgrade your BMW’s cooling system with a dependable solution that meets or exceeds OEM quality.

Coolant Flange - Rear/Engine Block

Fits European models only

5X Entries Into Our F80 M3 Sweepstakes

T#:55533481

Part#: 11531708808

Ships on Oct 13, 2026

$ 9.99 USD

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$ 9.99 USD

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This Meyle Original-grade replacement coolant flange is the perfect solution for refreshing your BMW’s cooling plumbing back to factory-fresh operation.

Meistersatz Temperature Sensor

T#:379740

Part#: 13621433076

In Stock at Vendor

$ 15.99 USD

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$ 15.99 USD

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Monitors coolant / oil temperature

Radiator Support Bracket

2X Entries Into Our F80 M3 Sweepstakes

T#:14122755

Part#: 17117514402

Back Ordered

$ 8.99

This product was last offered at the strikethrough price on
08-13-2026

$ 8.24 USD

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$ 8.24 USD

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Mounts to top of radiator bracket, 2 per vehicle.

Radiator Drain Plug With Housing

For vehicles with automatic transmission only

2X Entries Into Our F80 M3 Sweepstakes

T#:593032

Part#: 17111437360

In Stock

$ 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.

Auxiliary Fan Switch

Mounted in upper radiator hose, controls operation of auxiliary fan Mounted in lower radiator hose, controls operation of auxiliary fan

2X Entries Into Our F80 M3 Sweepstakes

T#:376847

Part#: 13621433077

Back Ordered

$ 10.99 USD

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$ 10.99 USD

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Comes with related o-ring

Lower Radiator Mount - Priced Each

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

BMW Radiator Hose Kit - 11537830715

2X Entries Into Our F80 M3 Sweepstakes

T#:46719180

Part#: CHK0376R

Ships in 3 Business Days

$ 43.99 USD

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$ 43.99 USD

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Keep your cooling system sealed, strong, and ready for anything with this Rein radiator hose kit—your all-in-one fix for cracked, leaking, or worn factory hoses. Years of heat, pressure, and age can cause rubber to weaken, split, or swell, setting the stage for coolant leaks and potential overheating. Rein hoses are engineered to meet or exceed OEM standards, built from premium, heat-resistant materials that can take on extreme temperatures and system pressures without faltering. Each hose features factory-correct bends, fittings, and diameters for an exact, hassle-free installation—no cutting or forcing required. Whether you’re tackling a full cooling system refresh or chasing down a small coolant leak, this Rein kit provides everything needed to restore confidence and performance under the hood. Why choose this Rein radiator hose kit: Factory-level precision – Direct-fit replacements that deliver OEM-quality reliability. Built to last – Resists cracking, swelling, and chemical damage from daily heat cycling. Confidence restored – Prevents coolant loss, overheating, and on-road breakdowns. All-in-one upgrade – Includes upper and lower hoses for a complete system refresh. If keeping your BMW’s cooling system running tight and trouble-free is the goal, Rein brings the dependable quality and fitment you can count on—engineered to perform just like factory, mile after mile.

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