Re: ac problems 1972 c10
Check both the anti-dieseling relay (located on lower dash lip between glove box and climate control panel) and the blower motor relay (located on right side of heater core box, behind glove box). Simply disconnect the anti-dieseling relay when testing. If the low/medium speed resistor is faulty (located in air distribution box), the fan should still work on high speed as the resistor is bypassed.
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