1988 GMC Sierra air conditioner has no power at dashboard display, no blower, no heater. Checked the fuse dasand it is okay. Found a relay on firewall, but how can I tell if this is problem?


Asked by Apr 10, 2014 at 02:53 PM about the 1988 GMC Sierra 1500

Question type: Maintenance & Repair

Checked the dashboard fuse and it is okay. Found a relay on firewall, but how can I tell if this is problem?

1 Answer

Jonathan Grunwald

I had the same and turned out to be the controller module Had gone thru 2 then gm found a wire back feeding and blowing the unit. Had them run a new wire and put new controller in , no issues any more..... This is on my 97 gmc

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