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need to remove dashboard, all things on it must be remove to have the full access to the heater core. partly it is made of aluminum. and find holder to be remove so the entire heater core can be remove.
May just be a blower motor. If you can access the motor, turn the heater on high ang check for power at the motor. If there is power, it is the motor that is the problem.If there is no power at the motor, you will need to check the fuses If they are ok, it will be a wiring problem.
You will need to remove the glovebox and you will see the blower motor at the top right side. Remove the screws holding it, disconnect the electrical connector and remove it from the car. It is a tight squeeze, be patient.
check if you can here the fan running. If not the cause can be that the bushes have reached there limit and need to be replaced. If you have the time and tools, you can remove the motor and get to the bushes. You will find that they have been worn down to a curn shape. If you remove each bush, and flip it 180 degrees, then the tip of the bush will make contact with the motor shaft. This will give you many months of fan life and save you a packet. You could also replace the buses with new ones - Audi do not sell them but can be matched by good auto shops.
ONE OF THE HEATER DISTRIBUTION FLAP MOTORS DEFECTIVE. UNSCREW GLOVEBOX AND YOU WILL SEE THE MOTORS.TEST WITH THE BLOWERS ON ,TRY EACH VENT TO FIND FAULTY MOTOR...
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