Car engine cooling system Audi A6 C5

General information
The car engine is operated in various climatic conditions and under various loads. At the same time, the temperature of the coolant, and therefore the engine,...

Checking the cooling system
The cooling system can be checked for leaks and the functionality of the overpressure relief valve using a pressure tester, such as the HAZET 4800-1 with...

Cooling liquid
The engine cooling system must be filled with a mixture of water, antifreeze and anticorrosive agent. Additives to the coolant prevent the engine block from...

Coolant mixture composition
In our latitudes, protection against freezing should be effective up to approximately -25°C. The proportion of antifreeze should not exceed 60% (which...

Replacing the coolant
The coolant must be replaced after any work on the cooling system components with draining the coolant. If the cylinder head, cylinder head gasket, radiator or...

Thermostat
Engine 1.8-I/125 hp. Removal The thermostat is located in the exhaust pipe of the cylinder block behind the generator. Remove the ground cable from the...

Radiator
Removal Drain the coolant. Remove the front bumper. Disconnect the upper and lower hoses from the radiator. To do this, remove the retaining clips (see fig....

Water pump
Engine 1.8-I/125 hp. The water pump is located in the cylinder block and is driven by a toothed belt. Removal Drain the coolant Remove the poly V-belt. Unscrew...

Diagnostics of engine cooling system faults
Malfunction: If the coolant temperature is too high, the indicator lamp on the instrument cluster lights up.

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A6(C5 AR, 1999-2005)

A6(C5, 1997-2004)

A6(C4, 1994-1997)