Vehicle cooling system Audi 100 C4, petrol

This is how cooling happens
When the engine is running, the water pump constantly pumps coolant through the engine's many cooling passages and removes the heat generated in the cylinders...

Checking the coolant level
Permanent check Although there is a coolant temperature/coolant level indicator, you should not rely solely on it, and from time to time it is necessary to...

Adding coolant
A noticeable loss of coolant is a sign of a malfunction or breakdown. The coolant is not consumed, and in a closed cooling system it cannot evaporate either....

Frost resistance test
To check the frost resistance of the coolant, you need a special device - a hydrometer. They measure the specific gravity of a liquid. Due to different...

Checking the cooling system for leaks
Defective places in the cooling system are easiest to determine when the engine is hot and, accordingly, the operating pressure in the cooling system. But in...

Radiator
The radiator is equipped with so-called plastic tanks. They are located on the models with a 4- and 6-cylinder engine on the right and left on the radiator, on...

Threaded bottle cap
Under conditions of increased pressure in the cooling system, the expansion tank screw cap plays an important role: When the cover is closed, its sealing...

Thermostat
In simple terms, the thermostat determines whether the coolant will circulate or not. That is, it determines whether the coolant should flow through the small...

List of faults
Thermostat Hint: If the engine boils on the road due to a faulty thermostat, either a tow truck or removing the thermostat on site can help. If you decide to...

Water pump
In order for the coolant to circulate in the cooling system, it is pumped by a water pump. It is actuated in different ways, depending on the type of engine:...

Cooling system fan
Depending on the type of engine, various fans of the engine cooling system are installed in the Audi-100. Models with 4- and 6-cylinder engines are equipped...

Cooling Fan Malfunctions
In addition to a stuck thermostat and a torn V-belt (only in models with 4-cylinder engine) too high coolant temperature can be caused by a defective cooling...

Hydraulic fan
Only 5-cylinder engines The hydraulic fan creates a continuous airflow through the grille when there is not enough flow from the main electric fan. To extend...

List of malfunctions of the cooling system

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