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Anonymous
Anonymous Posted on Jun 06, 2011
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--2005 GMC Envoy AC Trouble--(compressor still active) Have replaced blower motor (original one had "burn" evidence), resistor and resistor connector. The blower is still not working. Have checked voltage at blower switch (behind speed dial/knob). Brown and green wires respond but each motor speed wire doesn't respond on voltage meter. Have also checked voltage of resistor and it doesn't respond either. Any advice on what to try next?

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Jonah Oneal

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  • GMC Master 14,092 Answers
  • Posted on Jun 06, 2011
Jonah Oneal
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SOUND LIKE BAD BLOWER MOTOR RESISTOR.CHECK BLOWER MOTOR HI BLOW FUSE AND RELAY.YOU WILL NEED OWNERS MANUAL IN GLOVE COMPARTMENT TO LOCATED BLOWER MOTOR FUSES AND RELAYS.

  • 2 more comments 
  • Anonymous Jun 06, 2011

    Have checked the 40 amp fuse under the hood as well as the 30 amp in the fuse "box" behind the driver's seat. Both seem OK.

  • Jonah Oneal Jun 06, 2011

    FUSE OKAY SHOULD BE RELAY ALSO CONTROL BLOWER MOTOR HI SPEED CONTROL IF RELAY OKAY NEED LET DEALERSHIP CHECK HVAC MODULE CONTROL SWITCH.

  • Anonymous Jun 06, 2011

    just loosened blower motor. speeds 1-4 work now. apparently it was over tightened and hinging the motor.
    what should i do for speed 5?

  • Jonah Oneal Jun 06, 2011

    CHECK MAKE SURE BLOWER MOTOR WIRES IN PLACE TIGHT GETTING GOOD GROUND. PROBLEM IN SWITCH OR RESISTOR IF YOU CANT GET SPEED 5. IF YOU LOOSEN MOVE BLOWER MOTOR AND IT RUNS MORE LIKELY ELECTRICAL WIRES WAS NOT IN PLACE TIGHT.

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