Rein BMW Cooling System Parts & Accessories for BMW 3 Series E36 (1992-1998)

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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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OEM Rein Heater Core, Expansion Tank, Throttle Body Coolant Hose - E3...
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T#:6965
Part#: 11531738053
In Stock
$ 41.99 USD
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This is the large "T" shaped heater hose that connects the engine with the radiator expansion tank, heater core and throttle body. Fits E36 3 series with M50 or S50 engine.

This item fits the following BMWs:
1992-1999 E36 BMW 325i 325is 325ic M3
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Rein Thermostat - 88�C - E30, E34, E36, Z3
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T#:591800
Part#: 11537511580
Ships in 3 Business Days
$ 37.99 USD
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Common point of failure in the cooling system.
OEM Rein Lower Radiator Hose - E36 318 M42 1.8L
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T#:6957
Part#: 11531721709
Ships in 3 Business Days
$ 21.99 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.

Rein Coolant Bleeder Screw CHW1575 - Priced Each
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T#:591955
Part#: 17111712788
In Stock
$ 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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Rein Thermostat O-Ring (60 X 3.5 mm) - E28 E30 E32 E34 E36 E39 Z3 E23...
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T#:591144
Part#: 11531265084
In Stock at Vendor
$ 2.05 USD
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This O-ring seals the thermostat to the cylinder head.
OEM Rein Expansion Tank Return Hose - E36 323is/ic, 328i/is, M3 ...
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T#:14593
Part#: 11531740649
In Stock
$ 29.99

This product was last offered at the strikethrough price on
05-22-2026

$ 18.99 USD
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$ 18.99 USD
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This is the radiator expansion tank return hose for the cooling system on E36 models with the M52 or S52 engine. This hose goes from the expansion tank to the main coolant return pipe.

This item fits the following BMWs:
1996-1998 E36 BMW 323is 323ic 328i 328is 328ic M3
1996-1998 Z3 BMW Z3 2.8
1998-2000 Z3 BMW M Roadster M Coupe
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Rein Coolant Hose - E36
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T#:591767
Part#: 11531703844
In Stock
$ 8.14 USD
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This is the heater hose that connects between the heater valve and the heater return hose
Rein Thermostat - 92C
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T#:34114254
Part#: 11537511083
In Stock at Vendor
$ 11.99 USD
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Rein Thermostat 92C is an essential component designed to regulate the temperature in BMW engines, ensuring the vehicle runs at optimal performance while preventing overheating. Engineered to open at 92°C, this high-quality thermostat allows for precise coolant flow, keeping the engine at the correct temperature for maximum efficiency. Available at Turner Motorsport, the Rein Thermostat 92C is designed specifically for BMW vehicles, offering a direct-fit replacement that ensures easy installation and reliable operation.

  • Opens at 92°C for precise temperature regulation
  • Designed specifically for BMW engines for perfect fit and compatibility
  • Prevents engine overheating and helps protect critical engine components
  • Enhances overall engine efficiency and performance
  • Manufactured from durable materials for long-lasting reliability
  • Direct-fit replacement for easy installation

The Rein Thermostat 92C is the ideal solution for BMW owners who want to ensure their vehicle’s engine operates efficiently and reliably, providing optimal temperature control and enhanced performance.

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Rein Radiator Hose - Upper - E36, Z3
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T#:6973
Part#: 11531743535
Ships in 3 Business Days
$ 16.99 USD
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OEM BMW ENGINE WATER HOSE 11531743535.--

This item fits the following BMWs:
BMW 3 Series - 318i, 318i Convertible, 318is, 318ti
BMW Z Series - Z3 1.9

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OEM Rein Expansion Tank Cap - BMW E32 E34 E36 E38 E39 E46 & More ...
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T#:340541
Part#: 17111742231
In Stock
$ 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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OEM Rein Upper Radiator Hose - E36 325/328/323/M3
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T#:1299
Part#: 11531708499
In Stock
$ 12.99 USD
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This is the coolant hose that connects the upper radiator outlet to the thermostat housing. Any time you are into the cooling system, either for a radiator, water pump, thermostat, etc, you should consider installing fresh new hoses as a preventative measure.

This item fits the following BMWs:
1992-1998 E36 BMW 323is 323ic 325i 325is 325ic 328i 328is 328ic M3
1997-1998 Z3 BMW Z3 2.8
1998-2000 Z3 BMW M Roadster M Coupe with S52 engine
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Expansion Tank Hose
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T#:375751
Part#: 17111723521
Ships in 1 Business Day
$ 16.99 USD
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$ 16.99 USD
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Connects the expansion tank to the radiator


Rein - Throttle Body Hose - E36 318i, Z3 1.9
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T#:33980410
Part#: 11531247398
Ships in 1 Business Day
$ 6.83 USD
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Throttle Body Hose by Rein is a key component designed to optimize airflow to your BMW’s engine, ensuring enhanced throttle response and overall engine performance. This hose connects the air intake system to the throttle body, delivering a precise flow of air that improves fuel efficiency and engine power. Manufactured from high-quality, heat-resistant materials, the Throttle Body Hose by Rein is built to withstand extreme temperatures and pressures, making it a durable and long-lasting solution for your BMW. Available at Turner Motorsport, this hose is a direct fit replacement, ensuring easy installation and perfect compatibility with OEM standards.

  • Optimizes airflow to the throttle body, improving engine performance and efficiency
  • Enhances throttle response, contributing to smoother acceleration
  • Constructed from durable, heat-resistant materials, ensuring long-lasting performance
  • Direct fit replacement, allowing for easy installation and OEM compatibility
  • Boosts overall engine efficiency, improving fuel economy and engine power

Turner Motorsport offers the Throttle Body Hose by Rein as a reliable solution to maintain your BMW’s air intake system, ensuring smooth and efficient engine operation.

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Coolant Hose from Expansion Tank - E36
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T#:6964
Part#: 11531730351
Ships in 1 Business Day
$ 18.79 USD
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This coolant hose connects the water hose part #11531738053 to the radiator coolant expansion tank.Fits E36 3 series with M50, S50 or S52 engine.

This item fits the following BMWs:
1992-1998 E36 BMW 325i 325is 325ic M3
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OEM Rein Heater Core Return Hose - E36 318 M42/44
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T#:11079
Part#: 64211387010
Ships in 3 Business Days
$ 6.11 USD
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Runs from the water valve to the engine. 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.

This item fits the following BMWs:
BMW 3 Series - 318i, 318i Convertible, 318is, 318ti

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OEM Rein Coolant Hose - E36 Z3
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T#:379763
Part#: 11531743295
In Stock at Vendor
$ 13.99 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 Rein Cooling Hose - E36, Z3
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T#:362532
Part#: 13541703865
In Stock at Vendor
$ 19.83

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

$ 18.99 USD
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$ 18.99 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.
Rein Water Hose - 11531247915 - E36
For vehicles with a production date from 07/1994
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T#:35735
Part#: 11531247915
Ships in 3 Business Days
$ 9.99 USD
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$ 9.99 USD
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BMW Water Hose -
This item fits the following BMW Chassis:
E36

Fits BMW Engines including:
M42


OEM Rein Lower Radiator Hose - E36, Z3 M44 1.9L
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T#:6873
Part#: 11531247261
Ships in 1 Business Day
$ 10.99 USD
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Connects the thermostat to the lower radiator. 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.

This item fits the following BMWs:
BMW 3 Series - 318i, 318i Convertible, 318is, 318ti
BMW Z Series - Z3 1.9

​Fits BMW Engines including:
M44

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Rein Radiator Hose - Lower - E36
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T#:348769
Part#: 11531726344
In Stock
$ 15.99

This product was last offered at the strikethrough price on
06-11-2026

$ 13.99 USD
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$ 13.99 USD
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Replace your radiator hose before a blown hose leaves you stranded.

Rein Coolant Hose - E36
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T#:35875
Part#: 11531703844
Ships in 5 Business Days
$ 9.17 USD
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BMW HOSE F RADIATOR AND ENGINE R

Coolant Expansion Tank With Cap - 17111712835
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T#:46616014
Part#: EPK0012
Back Ordered
$ 29.99 USD
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The coolant expansion tank provides a place for excess fluid as coolant expands and contracts with temperature changes. Constant exposure to these extremes can cause the tank to crack, break, or suffer damage to its nipples or mounting points. To keep your cooling system sealed and functioning properly, any damaged tank should be replaced.
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Water Pump O-Ring
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T#:592886
Part#: 11511714519
Back Ordered
$ 9.17 USD
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