Questions and Answers

GMC Jimmy Blows High Only Q. Hi, I have a 1979 GMC Jimmy and I have a problems with the blower constantly running with the switch off. The blower is new about two months. I have replace the heater control switches and the heat element and the electric plug by the blower. The blower still keeps running. What could cause the this problem? Thank you for your time!

A. You have power to the fan all the time? You need to install a test light on this wire and start unplugging connectors working your way into the HVAC control head. I think it's in the control head but when unplugging things, keep checking for power on the purple wire. Possibly the high blower relay stuck on?