I just recently bought an 02 a4 and it is great except for the ac. When I am driving the car cools fine but when I have to stop at a light the air blows warm. But as soon as I start driving it cools down. I have recharged it and it is full. Any suggestions

 

first make sure your condensor fins arent clogged or alot of them arent bent over. second it could be that one of the fans isnt working. make sure when your engine is on and your ac is on the coldest possible on a hot day, look behind the radiator and make sure atleast one if not both of the fans is turning