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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Turner Motorsport - Corporate Logo
T#:338927
Part#: HOSE-CLAMPS
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$ 3.99

This product was last offered at the strikethrough price on
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Starting at $ 3.87 USD
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Hose clamps for radiator hoses, coolant hoses, vacuum hoses, or intake hoses. These hose clamps are the same style as your OEM hoses with a smooth inside band to prevent cutting into the hose material.
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URO Coolant Expansion Tank - E30 325e 325i 88-91
For vehicles with production date from 09/1987
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URO - Corporate Logo
T#:2453609
Part#: 17111712641
In Stock
$ 46.99 USD
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$ 46.99 USD
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This coolant reservoir is for the E30 325i 1988-1991. We have found that the expansion tanks should be replaced based on age as well as condition. This item fits the following BMWs: 1988-1991 E30 BMW 325e 325es 325i 325ic 325is 325ix
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Bav Auto Tools - Corporate Logo
T#:580395
Part#: B8800082
In Stock
Sale - Save 15% $ 32.99

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

$ 28.04 USD
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$ 32.99

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

$ 28.04 USD
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Multiple adapters include to fit a variety of vehicles.

Radiator Fan Switch
For vehicles with production date from 09/1987
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URO - Corporate Logo
T#:361996
Part#: 61311378073
In Stock
$ 26.44 USD
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$ 26.44 USD
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Measures radiator air temperature enabling the fan to turn off or on

Race German - Corporate Logo
T#:6827887
Part#: RGCTSAM12
Ships in 3 Business Days
$ 35.99 USD
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Race German has devoted themselves to providing quality products for late model BMWs that cover both street and track applications. Race German has now grown their catalog to a wide variety of models and products geared towards keeping your car looking and running nice. For those looking to install an aftermarket coolant temp gauge, Race German has the perfect accessory for you! This adapter is machined out of aluminum and splices into your upper radiator hose. Perfect for use with Race German's E30 temperature gauge but has compatibility with a wire variety of other cars as well! Features: Tapped for M12x1.5 sized sensor 38mm diameter outlets which fit most BMW hoses Includes 2x hose clamps **Does not include temp sensor
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Bav Auto Tools - Corporate Logo
T#:580348
Part#: B8800019
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This product was last offered at the strikethrough price on
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$ 23.99 USD
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$ 29.99

This product was last offered at the strikethrough price on
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$ 23.99 USD
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Used to remove your fan clutch

Heater Hose
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URO - Corporate Logo
T#:363331
Part#: 64218367790
In Stock
$ 34.99 USD
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Used to connect to the inline thermostat
BMW E30 Coolant Hose - Return Line
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URO - Corporate Logo
T#:362004
Part#: 11531722743
In Stock
$ 42.39 USD
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Attaches the thermostat to the bottom of radiator

Race German - Corporate Logo
T#:6827888
Part#: RGCTSA1/8NPT
In Stock
$ 35.99 USD
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Race German has devoted themselves to providing quality products for late model BMWs that cover both street and track applications. Race German has now grown their catalog to a wide variety of models and products geared towards keeping your car looking and running nice. For those looking to install an aftermarket coolant temp gauge, Race German has the perfect accessory for you! This adapter is machined out of aluminum and splices into your upper radiator hose. Perfect for use with Race German's E30 temperature gauge but has compatibility with a wire variety of other cars as well! Features: Tapped for 1/8NPT sized sensor 38mm diameter outlets which fit most BMW hoses Includes 2x hose clamps **Does not include temp sensor
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Bav Auto Tools - Corporate Logo
T#:580358
Part#: B8800031
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This product was last offered at the strikethrough price on
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$ 20.39 USD
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$ 23.99

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

$ 20.39 USD
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Used to remove your fan clutch
Thermostat Housing
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URO - Corporate Logo
T#:392721
Part#: 11531730470
In Stock
$ 39.99 USD
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This is a quality aftermarket replacement aluminum thermostat housing for cars with the M20 6 cylinder engine - 325e, 325i, 528e, 525i. This is the side of the housing that mounts to the cylinder head and has openings for the various coolant / engine temperature sensors. There are 4 ports for sensors so check your existing housing for the sensor layout.

If you're looking for a Genuine BMW factory replacement part, 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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Race German - Corporate Logo
T#:2602235
Part#: 001-08-00-00-09
Ships in 2 Business Days
$ 50.00 USD
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Often overlooked item for your 24V E30 swap, this sensor is the best option for a plug and play solution to have a working temperature gauge when doing a engine swap.


Water Pump - W/ Gasket
For vehicles with production date up to 09/1987
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URO - Corporate Logo
T#:372935
Part#: 11519071562
Ships in 2 Business Days
$ 51.99 USD
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$ 51.99 USD
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The water pump in your vehicle keeps all that coolant flowing freely. If it begins to fail, overheating problems are inevitable. Don't take a chance on doing damage to engine internals by not replacing your water pump.
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Thermostat Housing Cover
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URO - Corporate Logo
T#:367144
Part#: 11531265059
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$ 25.99 USD
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Replace your old or cracked thermostat cover
Bav Auto Tools - Corporate Logo
T#:580379
Part#: B8800058
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This product was last offered at the strikethrough price on
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$ 24.74 USD
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Angled jaws close, creating a complete seal every time you use them - the jaws are offset, making it possible to use in hard-to-reach locations. Made of glass-filled nylon for extra strength. These are perfect for use with brake lines, etc.
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Fan Clutch
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URO - Corporate Logo
T#:373086
Part#: 11521723027
Ships in 2 Business Days
$ 74.00 USD
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Direct replacement from URO

Water Pump
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URO - Corporate Logo
T#:372930
Part#: 11511734602
Ships in 2 Business Days
$ 49.99 USD
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Includes O-ring and metal impeller
URO Fan Blade - E12, E23, E24, E28, E30
Fits from 09/79 production date
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URO - Corporate Logo
T#:12996
Part#: 11521271846
In Stock at Vendor
$ 35.99

This product was last offered at the strikethrough price on
03-02-2026

$ 33.99 USD
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$ 33.99 USD
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The blades on your radiator cooling fan can get brittle and crack over the years. If cracked, the high speed rotation can cause the fan to spin apart. Don't take a chance on having your fan explode under your hood. Replace it now and keep your cooling proper and your radiator safe.
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Mahle - Corporate Logo
T#:594727
Part#: 11531713040
Ships on Aug 6, 2026
$ 35.99 USD
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The thermostat on your vehicle controls the flow of coolant based on temperature. When you just start your engine, the thermostat remains closed to accelerate the warm up process. After a few minutes, it opens up to allow the warm fluid to flow. If your vehicle is overheating but not blowing warm air from the heater, the problem is more than likely your thermostat.
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Coolant Expansion Tank Hose - E30 325e 325i 325is 325ix thru 1987 ...
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URO - Corporate Logo
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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URO Upper Radiator Hose - E30 325e 325i 1988-1991
For vehicles with production date from 09/1987
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URO - Corporate Logo
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

Radiator Hose - Upper
For vehicles with production date up to 09/1987
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URO - Corporate Logo
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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Coolant Hose to Throttle Housing Lower Nipple - E30 325e/i 88-91 E34 ...
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URO - Corporate Logo
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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URO - Corporate Logo
T#:50066848
Part#: 17121712736
In Stock
New Item
$ 12.79 USD
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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
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URO - Corporate Logo
T#:362013
Part#: 11531718982
In Stock
$ 5.99 USD
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Connects between the Water pump and the thermostat
Race German - Corporate Logo
T#:23947130
Part#: E30RADFANSP
In Stock
$ 17.99 USD
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Thanks to its brittle plastic construction, this radiator fan switch plug is a common failure point. Race German offers this high-quality replacement to remedy this issue and get your car back to perfect operation.
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Bavarian Autosport - Corporate Logo
T#:640208
Part#: 17117639022
In Stock
Sale - Save 15% $ 13.99

This product was last offered at the strikethrough price on
06-03-2026

$ 11.89 USD
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Sale - Save 15%
$ 13.99

This product was last offered at the strikethrough price on
06-03-2026

$ 11.89 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. 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.
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Coolant Hose
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URO - Corporate Logo
T#:362014
Part#: 13541289976
In Stock
$ 5.24 USD
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Connects to the thermostat housing

Coolant Hose to Throttle Housing Upper Nipple - E30 325e/i 88-91 E34 ...
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URO - Corporate Logo
T#:19433
Part#: 13541719967
Ships in 2 Business Days
$ 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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Radiator Hose - Lower
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URO - Corporate Logo
T#:361989
Part#: 11531279895
In Stock
$ 14.99

This product was last offered at the strikethrough price on
03-06-2026

$ 12.99 USD
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$ 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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Fuel Water Hose 13541705568
Up to production date 09/1987
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URO - Corporate Logo
T#:7238
Part#: 13541705568
In Stock
$ 5.99 USD
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$ 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

--.
Heater Hose
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URO - Corporate Logo
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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$ 6.50 USD
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Connects to the thermostat housing outlet.

Water Hose Outlet
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URO - Corporate Logo
T#:363556
Part#: 64218367791
In Stock
$ 8.99

This product was last offered at the strikethrough price on
03-25-2026

$ 6.99 USD
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$ 6.99 USD
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Used to connect to the inline thermostat

Rubber Grommet
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URO - Corporate Logo
T#:591950
Part#: 17111117442
Ships in 2 Business Days
$ 11.99 USD
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For mounting of radiator and oil cooler
URO Rubber Mount - Radiator - E30 E32 E34 E36 Z3
Lower For vehicles with production date from 09/1987 ¦ Lower
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URO - Corporate Logo
T#:591951
Part#: 17111178412
Ships in 2 Business Days
$ 3.12 USD
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$ 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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Race German - Corporate Logo
T#:2602237
Part#: M20WPUMPSTUDKIT
Ships in 2 Business Days
$ 11.99 USD
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Replaces the factory bolts with studs and nuts to make changing water pumps a breeze Features 3 Class 45H Allen Head Studs 3 Copper Flange Nuts


Water Hose
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URO - Corporate Logo
T#:373139
Part#: 11531266472
In Stock
$ 1.99 USD
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Return pipe to water pump
URO Engine Temperature Sensor
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URO - Corporate Logo
T#:37757224
Part#: 13621284397
Ships in 2 Business Days
$ 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.
URO Water Pump - BMW M20 M50
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URO - Corporate Logo
T#:639174
Part#: 11519070759
Ships in 2 Business Days
$ 52.99 USD
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The water pump in your vehicle keeps all that coolant flowing freely. If it begins to fail, overheating problems are inevitable. Don't take a chance on doing damage to engine internals by not replacing your water pump.
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URO Coolant Level Sensor - BMW E24 E30
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URO - Corporate Logo
T#:37757292
Part#: 61311361248
Back Ordered
$ 12.99 USD
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URO Coolant Level Sensor - BMW E24 E30

URO Coolant Level Sensor - BMW E24 E30 is the perfect solution for restoring accurate coolant level monitoring in your BMW. If you are experiencing a false "low coolant" warning or if your vehicle fails to notify you of dangerously low coolant levels, this high-quality replacement sensor will fix those issues. Designed as a direct-fit OE replacement, this sensor installs easily into your coolant reservoir tank with a simple plug-and-play wiring connection. Made from durable polymer and corrosion-resistant metal materials, this sensor is built to withstand the intense heat of your vehicle’s cooling system. Alloy conductors help minimize electrical resistance for accurate operation and long-lasting reliability.

  • Resolves false "low coolant" indicator light warnings
  • Prevents failure to alert the driver of dangerously low coolant levels
  • Direct-fit OE replacement design for easy installation into the coolant reservoir tank
  • Simple plug-and-play wiring connection for quick installation
  • Manufactured from high-quality polymer and corrosion-resistant metal materials to endure high cooling system temperatures
  • Alloy conductors reduce electrical resistance for precise operation
  • Designed and tested for long-lasting reliability
  • 24 Month Unlimited Mileage Warranty for peace of mind
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Coolant Temperature Sensor
For vehicles with production date up top 09/1985
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URO - Corporate Logo
T#:372927
Part#: 62110788115
Ships in 2 Business Days
$ 5.99 USD
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$ 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.
Coolant Hose
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URO - Corporate Logo
T#:362012
Part#: 11531287651
Ships in 2 Business Days
$ 11.99 USD
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From water pump to thermostat housing

URO Coolant Expansion Tank - BMW E30 E36 Z3 M42 M44, E34 325 ...
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URO - Corporate Logo
T#:362008
Part#: 17111712835
Ships in 2 Business Days
$ 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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URO Lower Radiator Hose - E30 325e 325i 1988-1991
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URO - Corporate Logo
T#:373016
Part#: 11531718980
Back Ordered
$ 8.03 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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URO Expansion Tank Cap - BMW E30
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URO - Corporate Logo
T#:592118
Part#: 17111468077
Back Ordered
$ 6.99 USD
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URO Expansion Tank Cap - BMW E30

The URO Expansion Tank Cap - BMW E30 is a crucial component for maintaining optimal cooling system performance by ensuring proper pressure regulation. Over time, older radiator caps lose their ability to hold pressure, leading to a lower boiling point and potential overheating issues. This high-quality replacement cap is designed to restore factory pressure levels, preventing coolant loss and maintaining engine efficiency. Crafted from durable materials, it resists wear and temperature fluctuations, ensuring long-lasting reliability.

  • Direct replacement for BMW E30 models
  • Maintains correct cooling system pressure to prevent overheating
  • Helps sustain optimal engine temperature and performance
  • High-quality construction for durability and reliability
  • Prevents coolant evaporation and system inefficiencies
  • Easy installation with OE-style fitment
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Expansion Tank Cap
For vehicles with production date up to 09/1987
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URO - Corporate Logo
T#:362007
Part#: 17114379047
Back Ordered
$ 7.99 USD
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$ 7.99 USD
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1.2 Bar pressure