Instruction book Audi Q5 Version year 2008
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 Audi Q5   General maintenance   Checking and topping up fluids  Cooling system
The radiator fan can start running spontaneously.
The radiator fan is driven by the engine via a poly V-belt. The speed of the fan is varied by a viscous clutch according to the temperature.
There is also an auxiliary electric fan, which cuts in automatically whenever the temperature of the coolant and the engine compartment rises above a certain level.
The auxiliary fan can continue to run for as long as 10 minutes after stopping the engine - even after the ignition is switched off. It may also start running suddenly WARNING! after a while if
  • residual heat raises the coolant temperature, or
  • the hot engine compartment is additionally heated up by the sun.
WARNING!
When working in the engine compartment be aware that the radiator fan may start running suddenly - risk of injury.
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