ventilation system always blows warm air. on 1990 Porsche 944

cant switch recirculation,

Asked by for the 1990 Porsche 944
There is a door that is stuck open in the system. It is sending air straight from the engine to you . I had this problem when I first got my 944. It is a very small plastic piece that cost only about 3 dollars that is causing the problem. I took of the dash and replaced it in a few hours and fixed problem.