Car engine cooling system BMW 3 Series E30

Coolant circuit
The coolant circuit has thermostatic control. When the engine is cold, the coolant circulates only in the cylinder head, as well as in the engine block and -...

Removal and installation, checking of the thermostat
As the engine warms up, the thermostat opens a large cooling circuit. If the thermostat fails, the engine overheats. This is determined by the temperature...

Removal and installation the radiator
If the car has a high mileage, the radiator may be clogged with particles contained in the coolant and lime deposits. This reduces the cooling efficiency and...

Removal and installation the fan and fan clutch
The fan clutch must be replaced if the hub is broken. In this case, the fan does not turn or turns with difficulty when the engine is off. The clutch must also...

Removal and installation the water pump
Removal Disconnect the ground wire from the battery. Drain the coolant from the engine (see section " Replacing the coolant "). Remove the fan. Loosen the belt...

Coolant — antifreeze
The cooling system is filled with a mixture of water and a frost-protective and anti-corrosion agent when it leaves the factory. This mixture prevents damage...

Maintenance work on the engine cooling system
Checking the coolant level The coolant level should be checked regularly - approximately every 4 weeks, and definitely before every long trip. Caution: When...

Checking the tightness of the cooling system
Check for cracks by squeezing and bending the coolant hoses; replace hardened hoses. The hoses must be pushed deep enough onto the fittings. Check the...

Replacing the coolant
The coolant must be replaced as part of the maintenance schedule every 2 years. Note: If the coolant is drained during repair work, it should be drained into a...

Frost resistance test
The frost resistance of the coolant should be checked before the onset of the cold season. Warm up the engine until the upper hose connected to the radiator is...

Adding BMW concentrate
Example: As a result of a hydrometer measurement on a 318i engine manufactured before August 1987, it was found that frost protection down to -10°C is...

Diagnostics of engine cooling system faults
Malfunction: high engine temperature, temperature gauge is in the red range of the scale.

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