Engine cooling system Audi A4 B5, petrol

This is how cooling occurs
The water pump, when the engine is running, constantly pushes the coolant through the engine's many cooling channels and thus removes the heat generated by...

Checking the coolant level
Constant control Despite the equipment for monitoring the temperature and coolant level, you should not rely only on the indicator, but also periodically check...

Antifreeze check
To check the frost resistance of the coolant, you need a hydrometer. It measures the specific gravity of the liquid. Due to the different addition of...

Checking the cooling system for leaks
Leaky areas in the cooling system are easiest to detect when the engine is hot and, accordingly, the cooling system is under operating pressure. Therefore,...

Radiator — removal and installation
The radiator is a reservoir made of synthetic material, which is equipped with fins on the right and left sides. From this collector, the coolant flows through...

Cooling system locking cap
In a pressurized coolant circulation system, the expansion tank cap plays an important role: The sealing surface of the screwed cap is firmly pressed against...

Purpose of the thermostat
Simply put, the thermostat is designed to determine whether the liquid in the radiator needs to be cooled or not, i.e. it "decides" whether the coolant should...

Help with thermostat problems
Thermostat Signs Cause/consequence A. The temperature rises slowly, operational temperature reached late, insufficient heating effect The thermostat valve...

Water pump
The coolant is circulated in a closed circuit by a water pump. On a four-cylinder engine, the water pump is located in the direction of travel, in front of the...

Water pump V-belt
With a six-cylinder engine, the water pump is driven by a toothed belt - everything should be fine here. The situation is different with a four-cylinder...

Different models of fans
The radiator fan - if it is not supplied with sufficient oncoming air flow - must itself create a constant air flow in the radiator fins. The air absorbs the...

Viscous fan
Here you see a viscous fan (radiator fan) six-cylinder engine. Its components: 1 - fan blade; 2 - Viscous clutch axle - for a six-cylinder engine with a large...

Electric radiator fan
In the Audi A4, an electric fan is installed only if there is enhanced cooling (automatic transmission, factory fitted towing device, air conditioning), it is...

Radiator fan malfunction
If the thermostat fails or the V-belt breaks (only with a four-cylinder engine), a non-working radiator fan can cause the coolant temperature to rise too high....

Help with cooling system problems
Malfunction Its reasons Your help A. The temperature indicator arrow is deflected to the limit to the right, the red signal light is flashing 1. Only with...

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A4(B8, 2007-2015)

A4(B7, 2004-2008)

A4(B6, 2000-2006)

A4(B6, 2000-2006, petrol)

A4(B5, 1994-2001)

A4(B5, 1994-2001, petrol)