About a week ago, the climate control system (heat/defroster/AC), regardless of the temperature setting (automatic or manual) is currently putting out air roughly the temperature of the sunny side of the planet Mercury. At first I thought the problem was only confined to the Air Conditioning as it was producing only hot air. I soon discovered that the heater/defroster was unaffected by any change in the temperature setting. It seems like the temperature control is stuck on the maximum setting. Another auto repair forum suggested the problem might be the Climate Control Stratification (Secondary) Temperature Blend Door.
First, obviously I would like to have some idea of what is causing this situation and if the above diagnosis is correct. Next, is it something that a person with a modest knowledge of auto mechanics could fix? If so, where would I be able to find instructions on how to do this repair? If not, what could I reasonably expect my local repair shop to charge to fix this?
I very much appreciate any assistance with this problem
Gerry