Ac/heat/defrost

Asked by Cheve18 Oct 28, 2019 at 10:12 PM about the 1987 Chevrolet Caprice Classic Brougham Sedan RWD

Question type: Maintenance & Repair

1987 cheve caprice
brougham over heated
change thermostat,
now the ac, heat,
defrost don't come on.
Took blower tested it
works also change
relay, and resistor, all
good, check fuse
good.
What could it be!
Thanks.

1 Answer
157,835

James answered 5 years ago

Look near the carburetor for a green wire. This is for the idle speed up device that is energized when AC or defrost is selected on the dash panel. If it was moved during the thermostat replacement or has fallen onto the hot engine the insulation has probably melted and the bare wire is touching something metal and creating a short. I believe there's a 30 AMP fuse inline near the alternator for high fan speed only. On older GMs it was there. If not check under the dash near the center for a lone fuse or a small fuse box with two or three fuses in it. Also check the fuses in the main fuse box that are labeled AC or anything having to do with AC. Hope that helps! Jim

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