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E46 (1998-2006) E46 (1998-2006, petrol) E36 (1990-2000) E30 (1982-1994) E21 (1975-1983)
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  • Cooling system characteristics

Cooling system characteristics (BMW 3 Series E21)

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Table of contents: Radiator ↓ Water pump ↓ Thermostat ↓ Water pump drive belt ↓ Fan ↓ Coolant ↓
The car uses a liquid engine cooling system with forced circulation of liquid, with an expansion tank.

Radiator



The radiator is a Behr tubular-finned type with transverse circulation. On cars with automatic transmission, an oil cooler is built into the right radiator tank.

Expansion tank valve opening pressure, kg/cm²:
  • safety: 1+0,15-0,10.
  • inlet: up to 0.9.

Water pump



The water pump is a vane type centrifugal pump. It is driven by a V-belt from the crankshaft pulley.

The gap between the impeller and the cover ring of the pump body, mm: 0.6±0.2.

Thermostat



Temperature of the main valve opening start,°C: 80±1.5.

Main valve piston stroke at 80±1.5°C, mm: 8.

Water pump drive belt



Brand and type: Continental SPZ 9.5 950 La Z, Kleber Venuflex AV 10 940 or Gates 6218 MC.

Fan



Prior to the 1980 model year, vehicles were equipped with a five-blade, two-speed electric fan driven by an electric motor, which was turned on and off by the electric fan switch.

Brand and type of fan: Bosch IPL 12V.

Fan diameter, mm: 366.

Since the 1980 model year, vehicles have been equipped with a nine-blade fan driven by a Holset sliding viscous clutch.

Fan brand: Walker.

Fan diameter, mm: 420.

Electric Fan Switch Sensors (up to 1980 model year)



Electric Fan Switch Sensors (up to 1980 model year)




Coolant



Capacity of engine cooling and cabin heating systems, l: 12.

The coolant used is a mixture of distilled water and antifreeze in a ratio of 60 and 40% (at temperatures up to -25°C).

Replacement frequency: every two years of operation.

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БМВ E21: Cooling and lubrication system
Next articles

Lubrication system characteristics
Oil pump parts
Removal and installation the oil pan
Removal and installation the oil pump
Removal and installation the pressure reducing valve
Cooling system parts


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Additional cooling system fan BMW 7 Series E38 (1994-2001)
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BMW E46 (1998-2006) 
  • General information
  • Manual
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  • Power unit
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  • Power system (gasoline)
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BMW E46 (1998-2006, petrol) 
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  • General information
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  • Supply system
  • Ignition system
  • 6-cylinder engine
  • Engine repair
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