I have an Audi A4, 2003, 1.8-T. The air conditioner works on the driver's side. The air is coldest from the fan that blows on the front windshield. However, no cold air comes out on the passenger's side of the car. The fans blow, but absolutely no cold air comes out on that 1/2 of the car.
What is causing this? How do I fix it?