when the engine is at idle, and the tranny in park, it blows cool air. When the tranny is in gear, and the engine is turning 1900+ RPM it blows cool air. When the tranny is in gear and the motor turns less than 1900 rpm it blows warm/hot air, even if it is turning 1700rpm while going 65mph down the road.
What is this? Low Refrigerant? Possible vaccume line issue?