Home
Cooling

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

Clear BMW chassis

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.

Sub-Categories

Sort By:

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

10X Entries Into Our F80 M3 Sweepstakes

T#:376806

Part#: 54155K23

Ships in 1 day

$ 4.99 USD

Add to Wish List

Qty

$ 4.99 USD

Add to Wish List

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

Show More Show Less

E46 325ci 06 (M56 Engine) OE BMW Radiator

T#:5800

Part#: 17117548432

Ships in 8 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

Add to Wish List

Qty

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

Add to Wish List

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

Show More Show Less

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

T#:4558

Part#: 64546988913

Ships in 3 Business Days

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

Add to Wish List

Qty

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

Add to Wish List

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

Show More Show Less

Oil Cooler Line O-Ring & Screw Kit

T#:55281750

Part#: 1722OCLKT

Ships in 3 Business Days

$ 20.60 USD

Add to Wish List

Qty

$ 20.60 USD

Add to Wish List

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

O-RING

T#:580584

Part#: C32348

Ships in 6 Business Days

$ 3.99

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

$ 2.99 USD

Add to Wish List

Qty

$ 2.99 USD

Add to Wish List

Bracket - Fan Housing - E46

T#:45829

Part#: 17112282209

Ships in 8 Business Days

$ 13.99 USD

Add to Wish List

Qty

$ 13.99 USD

Add to Wish List

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

Fits BMW Engines including:
S54

Anti-Freeze Tester

T#:641679

Part#: CTAA195

Ships in 5 Business Days

$ 9.98 USD

Add to Wish List

Qty

$ 9.98 USD

Add to Wish List

Tests all ethylene glycol solutions with radiator hot or cold

DO88 Aluminum Radiator - Blue Hose - E46 M3

T#:13891811

Part#: WC310B

Ships on Sep 18, 2026

$ 735.99 USD

Add to Wish List

Qty

$ 735.99 USD

Add to Wish List

The team at DO88 has vigorously tested this radiator to deliver peak performance with the peace of mind of quality for your E46 M3. They guarantee reliability and endurance in all situations to let your car breathe better than before! Boasting a 17% increase in core volume, this upgrade is a no-brainer for petrol heads like us. Keeping core temperatures low eliminates the risk of heat soak leading to overheating giving you max performance at any given moment. no compromise has been made at DO88 leaving you with one of the best radiator options on the market!

Show More Show Less

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

Add to Wish List

Qty

$ 314.99 USD

Add to Wish List

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

Show More Show Less

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

Add to Wish List

Qty

$ 3.99 USD

Add to Wish List

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

Add to Wish List

Qty

Sale - Save 22%

$ 23.99

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

$ 18.76 USD

Add to Wish List

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.

Show More Show Less

2 Pin Connector

10X Entries Into Our F80 M3 Sweepstakes

T#:33412932

Part#: 61132359999

In Stock

Sale - Save 25% $ 10.99

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

$ 8.24 USD

Add to Wish List

Qty

Sale - Save 25%

$ 10.99

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

$ 8.24 USD

Add to Wish List

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

Show More Show Less

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

Add to Wish List

Qty

$ 28.99 USD

Add to Wish List

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.

Show More Show Less

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

10X Entries Into Our F80 M3 Sweepstakes

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

Add to Wish List

Qty

Sale - Save 20%

$ 14.99

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

$ 11.99 USD

Add to Wish List

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.

Show More Show Less

BMW Coolant Flange

We Price Match - Give Us A Call or Chat!

T#:17339423

Part#: 17111707817

Special Order: No Guaranteed ETA

$ 47.99 USD

Add to Wish List

Qty

$ 47.99 USD

Add to Wish List

Water distribution pipe that connects the expansion tank to the radiator

Heater Hose

10X Entries Into Our F80 M3 Sweepstakes

T#:38621423

Part#: 64218376999

Ships in 6 Business Days

Sale - Save 22% $ 20.99

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

$ 16.31 USD

Add to Wish List

Qty

Sale - Save 22%

$ 20.99

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

$ 16.31 USD

Add to Wish List

Radiator Fan Clutch

10X Entries Into Our F80 M3 Sweepstakes

T#:57304041

Part#: 11527831619

Ships on Dec 29, 2026

$ 75.99 USD

Add to Wish List

Qty

$ 75.99 USD

Add to Wish List

Thermostat - 80°C

10X Entries Into Our F80 M3 Sweepstakes

T#:57507417

Part#: 11531318274

Special Order: No Guaranteed ETA

$ 59.99 USD

Add to Wish List

Qty

$ 59.99 USD

Add to Wish List

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 Sep 16, 2026

$ 18.99 USD

Add to Wish List

Qty

$ 18.99 USD

Add to Wish List

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

Show More Show Less

Meyle - Coolant Hose - Lower Right E46

5X Entries Into Our F80 M3 Sweepstakes

T#:40478120

Part#: 11531436408

Ships on Sep 16, 2026

$ 32.99 USD

Add to Wish List

Qty

$ 32.99 USD

Add to Wish List

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

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 Sep 16, 2026

$ 13.99 USD

Add to Wish List

Qty

$ 13.99 USD

Add to Wish List

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

Show More Show Less

Coolant Flange - Rear/Engine Block

Fits European models only

5X Entries Into Our F80 M3 Sweepstakes

T#:55533481

Part#: 11531708808

Ships on Sep 16, 2026

$ 9.99 USD

Add to Wish List

Qty

$ 9.99 USD

Add to Wish List

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

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

Add to Wish List

Qty

$ 8.24 USD

Add to Wish List

Mounts to top of radiator bracket, 2 per vehicle.

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

Ships in 1 Business Day

$ 10.99 USD

Add to Wish List

Qty

$ 10.99 USD

Add to Wish List

Comes with related o-ring

BMW Radiator Hose Kit - 11537830715

2X Entries Into Our F80 M3 Sweepstakes

T#:46719180

Part#: CHK0376R

Ships in 3 Business Days

$ 43.99 USD

Add to Wish List

Qty

$ 43.99 USD

Add to Wish List

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.

Show More Show Less

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

Add to Wish List

Qty

$ 10.99 USD

Add to Wish List

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

DO88 Coolant Hoses - Blue - E46 M3

T#:13924830

Part#: DO88KIT70B

Back Ordered

$ 256.99 USD

Add to Wish List

Qty

$ 256.99 USD

Add to Wish List

Made out of high-quality silicone, these hoses display the highest levels of durability and quality. With three to five layers of armory the hoses are designed to withstand high pressure and heat for an extended period of time. The OE hoses are known to crack and leak but this hose kit eliminates any chance of that.

Show More Show Less

Radiator Mount

2X Entries Into Our F80 M3 Sweepstakes

T#:56977984

Part#: 17117514402

Back Ordered

$ 6.99 USD

Add to Wish List

Qty

$ 6.99 USD

Add to Wish List

Maintain cooling system stability under spirited street driving and hard track use with this URO Parts replacement upper radiator mount bracket.

Lower Radiator Mount - Priced Each

T#:361005

Part#: 17111178412

Back Ordered

$ 2.03 USD

Add to Wish List

Qty

$ 2.03 USD

Add to Wish List

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

Meistersatz Temperature Sensor

T#:379740

Part#: 13621433076

In Stock at Vendor

$ 15.99 USD

Add to Wish List

Qty

$ 15.99 USD

Add to Wish List

Monitors coolant / oil temperature

1
…
7
8

Select Vehicle

Purpose

Category

Home

Cooling

Brand

View All Brands

Price

Special Offers

Shipping