Q: Blower resistor stays on - 1998 Volvo S90
We installed a used blower resistor and the fan blows all the time while the key is turned to on. The used one before this did the same thing. The car has a MCC climate control system. The fan switch didn’t turn it off. Could I test the resistor to see if it’s good with my digital multimeter? How do I rule out that it might be my climate control unit that is malfunctioning? The compressor doesn’t seem to be working either. Could the insufficient charge and low pressure switch be preventing the compressor clutch from working? Is my air conditioning compressor no good? We need to get this fixed before it gets really hot out.
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