Car engine cooling system BMW 3 Series E30

Coolant circuit
The coolant circuit is thermostatically controlled. While the engine is cold, the coolant circulates only in the cylinder head, as well as in the engine block...

Removal and installation, thermostat check
As the engine warms up, the thermostat opens the large cooling circuit. If the thermostat fails, the engine will overheat. This is determined by the...

Removal and installation of a radiator
With a high mileage of the car, the radiator may be clogged with particles contained in the coolant and lime deposits. As a result, cooling efficiency is...

Removal and installation of the fan and fan clutch
The fan clutch must be replaced if the hub is broken. At the same time, the fan does not turn when the engine is turned off or turns with difficulty. The...

Removal and installation of the water pump
Withdrawal Disconnect the ground wire from the battery. Drain the coolant from the engine (see section « Coolant replacement »). Remove fan. Loosen the belt...

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

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

Checking the tightness of the cooling system
By squeezing and bending the coolant hoses, check for cracks on them, replace hardened hoses. The hoses must be pushed deep enough into the fittings. Check the...

Coolant replacement
The coolant must be changed as part of the maintenance schedule every 2 years. Attention: If the coolant is drained during repair work, it should be drained...

Frost resistance test
Checking the frost resistance of the coolant should be carried out before the onset of the cold season. Warm up the engine so that the upper hose connected to...

Adding BMW Concentrate
Example: As a result of measuring with a hydrometer on a model 318i engine manufactured before August 1987, it was obtained that frost protection down to -10°C...

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