Rein 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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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.
Water Pump to Thermostat Cooling Hose - E30 E34 E28
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T#:6917
Part#: 11531287651
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$ 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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Rein Coolant Bleeder Screw CHW1575 - Priced Each
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T#:591955
Part#: 17111712788
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$ 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 Expansion Tank Hose - E12, E21, E23, E24, E28, E30, E32, E34 ...
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T#:19431
Part#: 17121712736
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$ 13.99 USD
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VENT HOSE 17121712736 Manufactured by CRP


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.
Thermostat Housing to Water Pipe Cooling Hose - E30 325e 325i ...
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T#:19253
Part#: 11531718982
In Stock
$ 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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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 Lower Radiator Hose - M42 E30 318i/is
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T#:6952
Part#: 11531717620
In Stock at Vendor
$ 16.99 USD
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Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure. This hose replaces the lower radiator hose that connects from the radiator outlet to the thermostat housing.

OEM Rein radiator hoses are always a perfect option when performing maintenance thanks to their high quality and longevity.

This item fits the following BMWs:
E30 BMW 318i, 318i Convertible, 318is

Fits BMW Engines including:
M42

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Rein Lower Heater Hose - E30
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T#:379681
Part#: 11531714636
Ships in 1 Business Day
$ 7.99 USD
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Heats & cools the throttle body

OEM Rein Upper Radiator Hose - M42 E30 318i/is
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T#:6953
Part#: 11531717622
In Stock at Vendor
$ 11.99 USD
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Replace your cracked or leaking radiator hose to prevent further leaks and potentially catastrophic failure. This hose replaces the upper radiator hose that connects from the thermostat housing to the radiator inlet.

OEM Rein radiator hoses are always a perfect option when performing maintenance thanks to their high quality and longevity.

This item fits the following BMWs:
E30 BMW 318i, 318i Convertible, 318is

Fits BMW Engines including:
M42

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Rein Expansion Tank Cap - E30, E34
For vehicles with production date from 09/1987
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T#:592018
Part#: 17137639023
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$ 14.99 USD
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$ 14.99 USD
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1.4 Bar pressure
OEM Rein Coolant Hose - E30
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T#:379799
Part#: 13541719967
In Stock at Vendor
$ 14.06 USD
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Fix that leak or replace that old line with this OE replacement!


Rein Coolant Hose - E28, E30, E34
For vehicles with production date from 09/1987
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T#:379671
Part#: 13541719966
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$ 6.11 USD
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$ 6.11 USD
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Thermostat to throttle housing
OEM Rein Thermostat Coolant Hose - E30 M20
For vehicles with a production date up to 09/1987
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T#:583586
Part#: 13541289976
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$ 8.81 USD
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$ 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.
Rein Thermostat 80C - E30 325e, E28 535i, E24 633CSi
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T#:34114243
Part#: 11531710953
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$ 19.99 USD
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Thermostat 80C is a crucial component for controlling the temperature in BMW engines, ensuring optimal performance and protection. Designed to open at 80°C, this thermostat helps your engine reach its ideal operating temperature quickly while preventing overheating. Engineered specifically for BMW vehicles, the Thermostat 80C ensures precise temperature regulation, enhancing both engine efficiency and longevity. Available at Turner Motorsport, this direct-fit replacement offers easy installation and reliable performance.

  • Designed for BMW engines for a perfect fit
  • Opens at 80°C to regulate coolant flow and maintain optimal temperature
  • Prevents overheating and improves engine efficiency
  • Manufactured from high-quality, durable materials for long-lasting use
  • Direct-fit replacement ensures hassle-free installation
  • Enhances overall engine performance and longevity

The Thermostat 80C from Turner Motorsport is the perfect choice for BMW owners looking to maintain optimal engine temperature, ensuring smooth operation and extending the life of their vehicle.

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Coolant Expansion Tank With Cap - 17111712835
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T#:46616014
Part#: EPK0012
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$ 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
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$ 9.17 USD
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