If you need a higher degree of frost resistance, you can increase the proportion of G 011 A8C, but only up to 60% or 54% for a V8 engine (frost resistance down to about -40°С), since a further increase in concentration leads to a decrease in frost resistance and a deterioration in the cooling effect. Exported to countries with cold climates (e.g. Sweden, Norway, Finland) vehicles are already factory filled with antifreeze for operation at temperatures down to -35°C. Use as a coolant additive (following the instructions on the packaging) only G 011 A8C or additive specification TL-WV 774 C. These additives are available from Audi. Other additives to the liquid can significantly impair its properties and, above all, the effect of corrosion protection. The resulting corrosion damage can cause coolant to leak and subsequently cause severe engine damage.
Coolant level control
The expansion tank is located on the left side of the engine compartment.
When the liquid level drops, the control lamp lights up. Despite this, it is recommended to check it from time to time. Reliably check the level is possible only when the engine is not running.
With a cold engine, the level should be between the marks "max" And "min" tank; when warm, the level may slightly exceed the mark "max".
Coolant leak
A coolant leak suggests, first of all, the presence of leaks in the cooling system. In this case, have the system checked by Audi immediately. You can not limit yourself to just adding liquid. If the tightness is intact, leakage can only occur when the coolant boils due to overheating and displacement from the cooling system.
Adding coolant
First stop the engine and let it cool down. Then cover the expansion tank cap with a cloth and carefully unscrew it one turn to the left, thus relieving excess pressure. After that, completely unscrew the plug.
Warning: The cooling system is under pressure!
If, due to extreme circumstances, it is necessary to add only water, then at the first opportunity, restore the standard concentration of the solution by adding the component prescribed according to the instructions.
In the event of a significant leakage of coolant, it can only be topped up after the engine has cooled down to avoid damage to the engine.
Do not overfill liquid above the mark "max": Excess fluid when it is heated is forced out of the system through the safety valve in the plug of the expansion tank!
Screw the stopper tightly.
Cooling fan
On 4- and 6-cylinder engines, the fan is electrically driven, controlled by a thermal switch, depending on the temperature of the coolant.
On 5- and 8-cylinder engines, the fan is driven via a ribbed V-belt from the engine. The fan is equipped with a viscous coupling that regulates its speed depending on the temperature. An additional motor driven fan with speed control is automatically activated during engine operation, depending on the temperature of the coolant.
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