Nothing is shorting to cause the AC switch to fail. GM failed to provide adequate contact size and or the correct material inside the switches. So when you turn the fan on the the load of starting the blower motor causes the contacts to arc. Over time the arcing destroys the contacts and either the switch quits working or the contacts get hot and overheat the switch and wiring. Which then let's the smoke out. 😒
You can rewire the switch to operate relays which in turn will operate the blower motor to correct the problem.
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If it breaks. I didn't want it in the first place.
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69 GTO \ 72 FIREBIRD \ 1/2 OF A 64 GTO \ 70 JAVELIN \ 52 FORD PU \ 51 GMC PU \ 29 FORD PU \ 85 ALFA ROMEO SPYDER \ A HANDFUL OF ODD DUCATI'S \ 88 S10 LT1 BLAZER & MY DAILY DRIVER 67 SUBURBAN.
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05-30-2025, 07:19 PM
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