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You need an auto electrician or the dealership. The heater and fan are part of the climate control and are computer operated. An auto electrician will connect a professional grade scan tool computer and diagnose the system.
Start by checking the condensor fan to make sure it is running while you have the ac on. If it is not blowing check the condensor fan motor fuse that is located in the totally integrated power module. If the fuse is bad it is most likely that the condensor fan motor is bad and is drawing too much amperage and will need to be replaced. Now I am assuming it has an electric condensor fan motor. Make sure that the condensor is free of debris, a dirty condensor will cause high discharge pressures that will cause poor or insufficient cooling at idle.
check for power at compressor clutch if power and earth there is ok new compressor required. no power there check relay and fuses swap air cond relay with another one that looks the same in under bonnet fuse and relay box
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