I've got a new problem with my climate control unit on my 97 Cougar. Heat and A/C work, but it's currently stuck on the Cold air side. Occasionally, it was switching to heat, when I turned the dial, but now it's stuck on Cold air. All the vents switch properly from floor to vent to defrost, etc. I'm not sure if this is a coincidence, but it started shortly after I had removed the climate control head for access to some wires that I wanted to examine. (Stereo antenna lead) I don't see anything damaged,broken or disconnected. My Haynes manual wiring diagram sucks, so any suggestions would be great.