Has anyone gotten no response from their automatic temperature control head? I have no fan, temp, or air-directional control. The only thing it will do is light up when the parking lights are turned on. I checked the HVAC fuse under the hood and the HVAC 1 fuse in the interior box and they are good and have a good power feed to the fuses.

 

You didn't provide any vehicle data... But when I parted out a 96 I took that unit and put it in my stock,as I replaced that car with a 97. Glad I did because that module failed the same way you describe and I had one on hand. That is most likely the issue you are dealing with,as it is only a plastic electro/vacuum switch and prone to age related failure.

 

Sorry about the vehicle data... I have a 2000 LT 4x4 with the 4.3 V6. So you just replaced the control head? Did you hear a hissing noise from under the dash before the control head went out?

 

Strange, my wife and I get in the Blazer to go to the store and the control head lights up and starts working?? Is there a circuit breaker somewhere that may have reset?