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BMW Cooling System Parts & Accessories for BMW 3 Series E30 (1984-1991)

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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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Radiator Hose - Upper

For vehicles with production date up to 09/1987

2X Entries Into Our F80 M3 Sweepstakes

T#:361990

Part#: 11531286914

In Stock

$ 15.99

This product was last offered at the strikethrough price on
04-28-2026

$ 12.99 USD

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$ 12.99 USD

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Hose from radiator to water pump 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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Genuine BMW Isa Screw - 07129905494

T#:28891

Part#: 07129905494

In Stock

5% off MSRP $ 7.74

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

$ 7.33 USD

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5% off MSRP

$ 7.74

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

$ 7.33 USD

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Genuine water pump hardware. M6x16-8.8. 6 of these screws are found in association with the water pump

Fan Delete Nut

T#:3459

Part#: 11511310640

In Stock

$ 17.99 USD

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$ 17.99 USD

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This BMW Motorsport part was designed for BMW touring car racing. This reverse thread nut covers the ugly exposed stud when you remove your engine fan and fan clutch. This simple part cleans up the look of an engine with the fan removed. Fits most BMW models. COOL!

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BMW Expanding Rivet

T#:7436

Part#: 17111712963

In Stock

$ 1.99 USD

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$ 1.99 USD

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The most common use for this rivet is to secure the radiator fan shroud to the radiator. This rivet can also be used on a wide variety of other applications as well.

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.

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Expansion Tank Cap - 1.4 Bar - E36 318i 323i 325i 328i M3

For vehicles with production date from 09/1987

We Price Match - Give Us A Call or Chat!

T#:340717

Part#: 17111742232

In Stock

$ 24.99

This product was last offered at the strikethrough price on
06-18-2026

$ 15.99 USD

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$ 15.99 USD

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This expansion tank cap, from the E30 325is, is designed to give way at 20 PSI instead of 30 PSI, like the stock cap. In the event the system over-pressurizes, this cap should let go first, potentially saving your radiator, hoses, or other vital cooling system components. While there's no guarantee it will save your radiator, this small part could mean the difference between calling a tow service and making it home, and a little extra insurance never hurt. This cap is a high-quality aftermarket part from an OE supplier.

Fits the Following BMWs:

E36 318i 323i 325i 328i M3

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Engine Coolant Temperature Sensor (Maroon Plug) - E30 318is, 325e/es ...

For vehicles with production date from 09/1985

T#:12657

Part#: 12621710512

Ships in 7 Business Days

$ 28.65

This product was last offered at the strikethrough price on
09-14-2026

$ 15.76 USD

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$ 15.76 USD

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This is the is the engine coolant temperature sensor that provides information to the instrument cluster temperature gauge. The insulator has a tan insulator.

This item fits the following BMWs:
1986-1991 E30 BMW 325e 325es 325i 325ic 325is 325ix M3
1991 E30 BMW 318i 318is 318ic
1986-1988 E28 BMW 528e

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Rein Thermostat O-Ring (60 X 3.5 mm) - E28 E30 E32 E34 E36 E39 Z3 E23...

2X Entries Into Our F80 M3 Sweepstakes

T#:591144

Part#: 11531265084

Ships in 4 Business Days

$ 2.99 USD

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$ 2.99 USD

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This O-ring seals the thermostat to the cylinder head.

BMW Antifreeze Coolant - 1 Liter Bottle

T#:11526

Part#: 82142209769

In Stock

$ 10.60

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

$ 10.57 USD

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$ 10.57 USD

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This 1 liter bottle is perfect for topping of the coolant in your BMW. This is The use of Original BMW Anti-Freeze/Coolant will ensure sufficient cooling in summer and protection against freeze-ups in winter. BMW Antifreeze/Coolant will also guard your vehicle's various engine components against corrosion. BMW Anti-Freeze/ Coolant will prevent excessive silicate gel precipitation, which may cause plugging of the cooling system and lead to more extensive repairs.

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Water Hose Outlet

2X Entries Into Our F80 M3 Sweepstakes

T#:363556

Part#: 64218367791

In Stock

$ 6.99 USD

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$ 6.99 USD

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Used to connect to the inline thermostat

Expansion Tank Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:50066848

Part#: 17121712736

In Stock

$ 12.79

This product was last offered at the strikethrough price on
08-31-2026

$ 10.99 USD

Limited Qty Sale

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Qty

$ 12.79

This product was last offered at the strikethrough price on
08-31-2026

$ 10.99 USD

Limited Qty Sale

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Coolant overflow hose designed to route excess coolant to and from the expansion tank, helping regulate system pressure and maintain proper coolant levels. Manufactured for correct fit and flow, it ensures reliable expansion tank operation and leak-free performance.

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Coolant Hose to Throttle Housing Lower Nipple - E30 325e/i 88-91 E34 ...

2X Entries Into Our F80 M3 Sweepstakes

T#:7242

Part#: 13541719966

In Stock

$ 7.99

This product was last offered at the strikethrough price on
03-31-2026

$ 7.68 USD

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$ 7.68 USD

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This is the hose that provides coolant to heat the throttle housing on M20 engines. It is connects to the lower nipple.

This item fits the following BMWs:
1988-1991 E30 BMW 325e 325es 325i 325ic 325is 325ix
1988 E28 BMW 528e
1989-1990 E34 BMW 525i

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Bremmen Coolant Bleeder Screw - BMW E30 E36 E38 E39 E46 E83 E90 Z4 ...

10X Entries Into Our F80 M3 Sweepstakes

T#:640140

Part#: 17111712788

Ships on Dec 24, 2026

Sale - Save 39% $ 3.99

This product was last offered at the strikethrough price on
09-02-2026

$ 2.44 USD

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Sale - Save 39%

$ 3.99

This product was last offered at the strikethrough price on
09-02-2026

$ 2.44 USD

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Plastic bleeder screw for cooling system is used to bleed air that would otherwise create an air pocket and lead to overheating. Includes o-ring seal.

Thermostat Housing to Water Pipe Cooling Hose - E30 325e 325i ...

2X Entries Into Our F80 M3 Sweepstakes

T#:19253

Part#: 11531718982

Ships in 2 Business Days

$ 6.55 USD

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$ 6.55 USD

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This is the cooling system water hose that goes from the thermostat housing to the water pipe on E30 3 series.

This item fits the following BMWs:
1988-1991 E30 BMW 325e 325es 325i 325ic 325is 325ix

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Coolant Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:362014

Part#: 13541289976

In Stock

$ 5.24 USD

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$ 5.24 USD

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Connects to the thermostat housing

Coolant Expansion Tank Hose - E30 325e 325i 325is 325ix thru 1987 ...

2X Entries Into Our F80 M3 Sweepstakes

T#:6920

Part#: 11531289257

In Stock

$ 10.99

This product was last offered at the strikethrough price on
04-20-2026

$ 6.76 USD

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$ 6.76 USD

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This hose goes from the expansion tank to the water pump. Replace any hoses that show signs of wear and deterioration before it's too late. This item fits the following BMWs: 1984-1987 E30 BMW 325e 325es 325i 325ic 325is 325ix

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BMW Brass Coolant Bleeder Screw - Priced Each

2X Entries Into Our F80 M3 Sweepstakes

T#:587673

Part#: 17111712788PRM

In Stock

$ 5.35 USD

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$ 5.35 USD

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Having an operational bleeder screw for your coolant system assures that when service is performed, all air pockets are removed. Having air pockets in your coolant system prevents your system from functioning properly. Your heat may not work as well and there is the potential for engine overheating if the air pocket is trapped behind the thermostat. Be sure that all of the air is bled out of your system with a new bleeder screw.

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Genuine BMW Coolant Bleeder Screw 17111712788

T#:7432

Part#: 17111712788

Ships in 1-2 days

$ 5.94 USD

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$ 5.94 USD

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This is the Genuine BMW Coolant bleeder screw. We recommend a heavy duty Aluminum replacement from ECS Tuning if you do not want to replace this part again when it fails.

Genuine BMW Vent Screw
This item fits the following BMW Chassis:
E36 M3,E46 M3,E85 Z4M,E53 48IS,E30,E34,E36,E38,E39,E46,E53 X5 X5,E83 X3,E85 Z4,E86 Z4,E90

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Coolant Hose to Throttle Housing Upper Nipple - E30 325e/i 88-91 E34 ...

2X Entries Into Our F80 M3 Sweepstakes

T#:19433

Part#: 13541719967

Ships in 2 Business Days

$ 11.99 USD

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$ 11.99 USD

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This is the hose that provides coolant to heat the throttle housing on M20 engines. It is connected to the upper nipple.

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 item fits the following BMWs:
1988-1991 E30 BMW 325e 325es 325i 325ic 325is 325ix
1989-1990 E34 BMW 525i

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Rein Expansion Tank Hose - E12, E21, E23, E24, E28, E30, E32, E34 ...

2X Entries Into Our F80 M3 Sweepstakes

T#:19431

Part#: 17121712736

In Stock

$ 13.99 USD

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$ 13.99 USD

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VENT HOSE 17121712736 Manufactured by CRP

Coolant Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:362013

Part#: 11531718982

In Stock

$ 5.99 USD

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$ 5.99 USD

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Connects between the Water pump and the thermostat

OEM Rein Expansion Tank Cap - BMW E32 E34 E36 E38 E39 E46 & More ...

2X Entries Into Our F80 M3 Sweepstakes

T#:340541

Part#: 17111742231

Back Ordered

$ 17.99 USD

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$ 17.99 USD

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This radiator expansion tank cap is used most BMW's from 1991-2006. It is a common failure item. When this item fails, it cannot hold pressure which results in your BMW overheating. If you are overhauling your coolant system, now is the time to consider preventative replacing this cap. It is also referred to as the coolant reservoir cap.

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URO Upper Radiator Hose - E30 325e 325i 1988-1991

For vehicles with production date from 09/1987

2X Entries Into Our F80 M3 Sweepstakes

T#:361993

Part#: 11531722218

In Stock

$ 12.89 USD

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$ 12.89 USD

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Hose from radiator to water pump

Rein Coolant Bleeder Screw CHW1575 - Priced Each

2X Entries Into Our F80 M3 Sweepstakes

T#:591955

Part#: 17111712788

In Stock

$ 4.99 USD

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Qty

$ 4.99 USD

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Coolant Bleeder Screw is a critical component for maintaining your BMW’s cooling system. Designed to release trapped air from the coolant lines, this screw ensures efficient coolant flow and prevents overheating. Specifically engineered for BMW models, it enhances the overall performance and longevity of your engine by maintaining proper temperature regulation. Comes with O-Ring.

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Water Pump to Thermostat Cooling Hose - E30 E34 E28

2X Entries Into Our F80 M3 Sweepstakes

T#:6917

Part#: 11531287651

In Stock

$ 10.99 USD

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Qty

$ 10.99 USD

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Replace your cracked or leaking coolant hose with this radiator coolant hose that goes from the waterpump to the thermostat on cars with the M20 engine. We recommend inspecting cooling system hoses for dry rot / cracks yearly.

This item fits the following BMWs:
1984-1991 E30 BMW 325e 325es 325i 325ic 325is 325ix
1982-1988 E28 BMW 528e
1989-1990 E34 BMW 525i

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Meyle Expansion Tank Cap

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

T#:579357

Part#: 3148009004

In Stock

Sale - Save 40% $ 14.99

This product was last offered at the strikethrough price on
05-15-2026

$ 8.99 USD

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Qty

Sale - Save 40%

$ 14.99

This product was last offered at the strikethrough price on
05-15-2026

$ 8.99 USD

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Replace worn or missing pieces.

Coolant Thermostat - Includes Sealing Gasket

5X Entries Into Our F80 M3 Sweepstakes

T#:54852031

Part#: 028 280 0004

In Stock

$ 11.99 USD

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$ 11.99 USD

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This Meyle-Original replacement thermostat is a direct-fit solution designed to maintain a rock-solid, factory-correct 80°C operating temperature.

Radiator Hose - Lower

2X Entries Into Our F80 M3 Sweepstakes

T#:361989

Part#: 11531279895

In Stock

$ 12.99 USD

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Qty

$ 12.99 USD

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During your radiator hose change, fluid loss is inevitable. Be sure to browse the website to get the proper replacement for your vehicle sent directly to your door. Also, be sure to order a new thermostat housing, as the stock plastic units often get broken or warped during removal

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Genuine BMW O-Ring - Priced Each

T#:367933

Part#: 17222245358

In Stock

$ 3.99 USD

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$ 3.99 USD

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Upgrade your BMW's oil or transmission cooling system with the Turner Motorsport Genuine O-Ring, part number 17222245358. This high-quality O-ring is designed to provide a reliable seal, ensuring optimal performance and preventing leaks in your BMW's vital systems. Additionally, it is compatible with MINI applications, where it is commonly used on the end of the parking brake cable.

Genuine BMW part for guaranteed quality and compatibility
Prevents leaks in the oil and transmission cooling systems
Ensures optimal performance of vital components
Compatible with MINI applications for versatile use

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OEM Behr Coolant Expansion Tank Cap 2.0 Bar - E36 E46 E34 E39 E32 E38...

T#:2766

Part#: 17111742231

In Stock

$ 20.99

This product was last offered at the strikethrough price on
09-10-2026

$ 19.99 USD

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$ 19.99 USD

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This radiator expansion tank cap is used most BMW's from 1991-2006. It is a common failure item. When this item fails, it cannot hold pressure which results in your BMW overheating. If you are overhauling your coolant system, now is the time to consider preventative replacing this cap. It is also referred to as the coolant reservoir cap.

Hailing from Stuttgart, Mahle-Behr specializes in automotive cooling systems. From air conditioning to engine cooling M-B has you covered with OE-quality replacement parts.

This item fits the following BMWs:
1990-1991 E30 BMW 318i 318is 318ic
1992-1998 E36 BMW 318i 318is 318ic 323is 323ic 325i 325is 325ic 328i 328is M3
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi M3
1989-1995 E34 BMW 530i 535i 540i M5
1991-1995 E34 BMW 525i
1997-2003 E39 BMW 525i 528i 530i 540i M5
1989-1994 E32 BMW 735i 735il 740i 740il 750il
1995-2001 E38 BMW 740i 740il 750il
2002-2008 E65 BMW 745i 745li 750i 750li 760i 760li
1990-1998 E31 BMW 840i 840ci 850i 850ci 850csi
2004-2011 E83 BMW X3 2.5i X3 3.0i X3 3.0si
2000-2006 E53 BMW X5 30.0i X5 4.4i X5 4.6is X5 4.8is
1996-2002 Z3 BMW Z3 1.9 Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i M Coupe M Roadster
2003-2008 E85 BMW Z4 2.5i Z4 3.0i Z4 3.0si M Roadster M Coupe
2000-2003 E52 BMW Z8 Z8 Alpina
2007+ E90 BMW 335i & 335xi

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Heater Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:362003

Part#: 11531289377

In Stock

$ 13.58

This product was last offered at the strikethrough price on
04-06-2026

$ 6.50 USD

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Qty

$ 6.50 USD

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Connects to the thermostat housing outlet.

Genuine BMW Radiator Drain Plug - E34 E36 Z3

T#:45724

Part#: 17111712816

Ships in 1-2 days

$ 8.99 USD

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Qty

$ 8.99 USD

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Genuine BMW Screw Plug -
This item fits the following BMW Chassis:
E30,E34,E36

Fits BMW Engines including:
M20,M42,M44,M50

Genuine BMW Hose Clamp 07129952104

T#:6533

Part#: 07129952104

In Stock

$ 3.99 USD

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Qty

$ 3.99 USD

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GENUINE BMW HOSE CLAMP 07129952104

Fuel Water Hose 13541705568

Up to production date 09/1987

2X Entries Into Our F80 M3 Sweepstakes

T#:7238

Part#: 13541705568

In Stock

$ 5.99 USD

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Qty

$ 5.99 USD

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FUEL SYSTEM WATER HOSE 13541705568.--

This item fits the following BMWs:
BMW 3 Series - 325e, 325es, 325i, 325ix
BMW 5 Series - 528e

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Genuine BMW Lower Thermostat Hose - E30 M3

T#:2678

Part#: 11531309668

In Stock

$ 14.99 USD

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Qty

$ 14.99 USD

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This Lower Thermostat Hose fits the following BMWs:
1988-1991 E30 3 Series M3

Genuine BMW Engine Water Hose 11531709050

T#:14575

Part#: 11531709050

In Stock

Sale - Save 59% $ 39.99

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

$ 16.38 USD

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Qty

Sale - Save 59%

$ 39.99

This product was last offered at the strikethrough price on
05-02-2026

$ 16.38 USD

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GENUINE BMW WATER HOSE

Genuine BMW Radiator Expansion Tank Hose - E30 M3

T#:2672

Part#: 11531309667

In Stock

$ 14.99 USD

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Qty

$ 14.99 USD

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This Radiator Expansion Tank Hose fits the following BMWs:
1988-1991 E30 3 Series M3

Gasket Ring

A18X22

T#:6495

Part#: 07119963300

In Stock

$ 1.99 USD

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Qty

$ 1.99 USD

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GENUINE BMW GASKET RING 07119963300

URO Rubber Mount - Radiator - E30 E32 E34 E36 Z3

Lower For vehicles with production date from 09/1987 ¦ Lower

2X Entries Into Our F80 M3 Sweepstakes

T#:591951

Part#: 17111178412

Ships in 2 Business Days

$ 3.12 USD

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Qty

$ 3.12 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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Coolant Temperature Sensor

For vehicles with production date up top 09/1985

2X Entries Into Our F80 M3 Sweepstakes

T#:372927

Part#: 62110788115

Ships in 2 Business Days

$ 5.99 USD

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Qty

$ 5.99 USD

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This coolant sensor is located in the coolant system, monitor the temperature for both the gauge and ECU.

Febi Freeze Plug - 11111714712

We Price Match - Give Us A Call or Chat!

T#:6570

Part#: 11111714712

In Stock

$ 3.99

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

$ 2.03 USD

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Qty

$ 2.03 USD

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ENGINE COVER LID 11111714712

OEM Rein Thermostat Coolant Hose - E30 M20

For vehicles with a production date up to 09/1987

2X Entries Into Our F80 M3 Sweepstakes

T#:583586

Part#: 13541289976

Ships in 2 Business Days

$ 8.81 USD

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Qty

$ 8.81 USD

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Over time, coolant hoses begin to get brittle and are susceptible to cracking and splitting. Replace your cracked or leaking coolant hose to prevent further leaks and potentially catastrophic failure.

OEM Mahle-Behr Coolant Expansion Tank Cap - E30 325e/i 1988-91, E34 5...

For vehicles with production date from 09/1987

T#:369633

Part#: 17111742232

Ships in 2 Business Days

$ 18.99 USD

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Qty

$ 18.99 USD

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This radiator expansion tank cap fits E30 325e 325es 325i 325is 325ix 325ic with M20 engine from 1988 . It is a common failure item. When this item fails, it cannot hold pressure which results in your BMW overheating. If you are overhauling your coolant system, now is the time to consider preventative replacing this cap. It is also referred to as the coolant reservoir cap.

This item fits the following BMWs:
1988-1991 E30 BMW 325e 325es 325i 325ic 325is 325ix
1989-1990 E34 BMW 525i with M20 engine

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Rein Coolant Hose - E28, E30, E34

For vehicles with production date from 09/1987

2X Entries Into Our F80 M3 Sweepstakes

T#:379671

Part#: 13541719966

Ships in 2 Business Days

$ 6.11 USD

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Qty

$ 6.11 USD

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Thermostat to throttle housing

Rein Lower Heater Hose - E30

2X Entries Into Our F80 M3 Sweepstakes

T#:379681

Part#: 11531714636

Ships in 2 Business Days

$ 7.99 USD

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Qty

$ 7.99 USD

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Heats & cools the throttle body

URO Engine Temperature Sensor

2X Entries Into Our F80 M3 Sweepstakes

T#:37757224

Part#: 13621284397

Ships in 2 Business Days

$ 7.99 USD

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Qty

$ 7.99 USD

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This sensor functions as an oil temperature sensor in air-cooled cars and a coolant temperature sensor in water-cooled cars.

Water Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:373139

Part#: 11531266472

Ships in 2 Business Days

$ 1.99 USD

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Qty

$ 1.99 USD

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Return pipe to water pump

URO Coolant Expansion Tank - BMW E30 E36 Z3 M42 M44, E34 325 ...

2X Entries Into Our F80 M3 Sweepstakes

T#:362008

Part#: 17111712835

Ships in 2 Business Days

$ 18.99 USD

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Qty

$ 18.99 USD

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The coolant expansion tank in your vehicle gives additional fluid a place to go after expansion and contraction from temperature change. Because it is subjected to such drastic changes on a regular basis, it can often crack or break

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Rein Expansion Tank Cap - E30, E34

For vehicles with production date from 09/1987

2X Entries Into Our F80 M3 Sweepstakes

T#:592018

Part#: 17137639023

Ships in 4 Business Days

$ 14.99 USD

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Qty

$ 14.99 USD

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1.4 Bar pressure

Coolant Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:362012

Part#: 11531287651

Ships in 2 Business Days

$ 11.99 USD

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Qty

$ 11.99 USD

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From water pump to thermostat housing

Rubber Grommet

2X Entries Into Our F80 M3 Sweepstakes

T#:591950

Part#: 17111117442

Ships in 2 Business Days

$ 11.99 USD

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Qty

$ 11.99 USD

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For mounting of radiator and oil cooler

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