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Home >> Ford >> 1993 >> Festiva GL, Automatic >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> A/C-Heater System - Manual >> Testing >> A/C System >> 10) A/C Control Circuit to Power Control Module (PCM)
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10) A/C Control Circuit to Power Control Module (PCM)

Turn ignition off. Reconnect WAC relay, A/C relay, cooling fan motor and A/C switch connectors. Disconnect blower motor connector and PCM connectors. Remove 15-amp heater fuse. Place blower switch in 1, 2 or 3 position and turn A/C switch on. Check resistance of Green wire between PCM connector (Pin 1Q) and ground with A/C switch on and then with it off. If resistance is less than 5 ohms, with A/C switch on and more than 10,000 ohms with A/C switch off, go to step 20). If resistance is more than 5 ohms, with A/C switch on, and less than 10,000 ohms with A/C switch off, go to next step.