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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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Achilles Motorsport OBD1-to-OBD2 Coolant Hose Adapter - BMW M52 S52 E...

For models with a OBD2 24v Swap (M5X, S5X engines) only!

T#:1150775

Part#: 11-AM-CHCAP-OBD1

In Stock

$ 54.99 USD

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$ 54.99 USD

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OBD2 to OBD1 Conversion Coolant Hose Adapter for E36 M52 & S52 Engines Replaces the metal pipe from the OBD2 engines with a hose adapter that allows the installation of a normal OBD1 coolant hose. This is useful when converting an OBD2 Engine to OBD1, or when swapping OBD2 engines into a car that is originally OBD1 (like an E30). The simple kit comes complete with the necessary 2 O-rings, extended bolt, Nylon Lock Nut & washers to make this a quick install. No need to wait! It is also completely reversible!

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Race German Coolant Temperature Sender Adapter - M12x1.5

T#:6827887

Part#: RGCTSAM12

Ships in 2 Business Days

$ 35.99 USD

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$ 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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Race German Coolant Temperature Sender Adapter - 1/8NPT

T#:6827888

Part#: RGCTSA1/8NPT

In Stock

$ 35.99 USD

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$ 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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Geba Water Pump (Metal Impeller) - E30 325e/I 88-91, E34 525i 89-90, ...

T#:3451

Part#: 11511719836

Ships in 4 Business Days

$ 72.99

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

$ 70.99 USD

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$ 70.99 USD

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This water pump fits BMWs with the M20 6 cylinder engine.

Geba builds all of their pumps to exceed factory specifications by using a metal impeller. This offers a huge improvement over stock and a massive increase in reliability. Servicing all major European models, Geba has you covered when it comes time for a new water pump.

This water pump 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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Race German Rethreaded Coolant Sensor

T#:2602235

Part#: 001-08-00-00-09

Ships in 1 Business Day

$ 50.00 USD

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$ 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 - E30/E36/Z3 318i/is/ic/Z3 1.9 with M42/M44 engine ...

T#:6022

Part#: 11510393338

Ships in 3 Business Days

$ 96.37

This product was last offered at the strikethrough price on
05-24-2026

$ 94.99 USD

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$ 94.99 USD

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Don't take your car's cooling system for granted!One of the biggest weak points is the cooling system. Replacing your waterpump will go a long way for keeping your car on the road and operating properly.

Geba builds all of their pumps to exceed factory specifications by using a metal impeller. This offers a huge improvement over stock and a massive increase in reliability. Servicing all major European models, Geba has you covered when it comes time for a new water pump.

This item fits the following BMWs:
1990-1991 E30 BMW 318i 318is 318ic
1992-1998 E36 BMW 318i 318is 318ti 318ic
1996-1998 Z3 BMW Z3 1.9

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Radiator Fan Switch Plug - E30, E34, E36, E23, E32

T#:23947130

Part#: E30RADFANSP

In Stock

$ 17.99 USD

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$ 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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Race German Water Pump Stud Kit

T#:2602237

Part#: M20WPUMPSTUDKIT

Ships in 1 Business Day

$ 11.99 USD

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$ 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

O-RING

T#:580584

Part#: C32348

Ships in 3 Business 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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Victor Reinz Coolant Pipe Gasket

T#:19371

Part#: 11121726721

Back Ordered

$ 3.05 USD

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$ 3.05 USD

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GASKET ASBESTOS FREE 11121726721 Manufactured by Reinz

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