2001 Cadillac Catera 6 cyl Two Wheel Drive Automatic 109000 miles
My car has no heat on right side of car. It has auto temp with a dile on both sides and the right side just blows cold air the left is fine. What might be the problem? Or must I take it to a dealer to have it checked on a computor?
The heat in that vehicle is controlled by a blend door that regulates heated air flow. It is operated by an electric motor/actuator. The problem can be that the actuator is stripped or inoperative or the door itself could be damaged. This is what needs to be determined by examining the actuator and see if it is responding to heat change commands or not.
This would require dash diss-assembly and some real body manipulation to reach it so it may be a job for the dealer.