Why does my GMC Yukon blow hot and cold air?
Why does my GMC Yukon blow hot and cold air? A small servo motor that turns hot and cold air valve in the heater box. I pulled the small flat motor off and noticed the shaft was jammed and would not turn when i moved the temperature selector knob from hot to cold. I reached in and turned the air valve with my finger and verified that it was not stuck. Where is the cold air heater on a GMC Yukon? It was cold out and the heat would not work in the front only. Turned out that the blend...