Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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Test the voltage and ground signals into the heater/ac control on the dash.If there is a loss of power or ground this can cause this fault here and this will need repaired to resolve this issue here.I have seen components like the electronic ignition switch itself cause an issue like this here needing replaced if it is sending low voltage to the heater controller.I have also seen a loose or corroded ground cause this issue as well here.If this is or was tested and found to be o.k. let me know so we can continue.
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