Question about 1995 GMC Sierra C1500

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1995 GMC Sierra fan blower not working.

Have disconnected the blower motor and hooked it up to another electrical source and it does work. Checked the resistor for continuity and it seems fine. Have replaced the switch and the relay and it is still not working. Totally stumped! Any help would be greatly appreciated.

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  • GMC Master
  • 21,873 Answers

In the beginning you should check for voltage and ground.
The 50amp fuse marked AC powers the blower motor and the motor is grounded.
The high speed relay bypasses the resistor. So you should have power coming from the fuse and thru the high relay. Then the resistor for the other speeds gets power from the heat and ac control module which also controls the blend doors.
You may need a shop manual or repair book to get the diagrams.

Posted on Jan 12, 2013

  • 6 more comments 
  • Faith Jones Jan 12, 2013

    There is no power going to the high speed of the relay. Wire connection is burnt. Any suggestions to repair the wire or what may have caused this wire to burn?

  •  Stephen
    Stephen Jan 12, 2013

    The wire is burned because of too much resistance. Is it the red wire going to the fuse or the purple wire going to the blower motor ?

  • Faith Jones Jan 12, 2013

    It is the red wire going to the relay.

  • Faith Jones Jan 13, 2013

    Replaced the resistor and still the blower motor won't work.

  • Faith Jones Jan 13, 2013

    After replacing the resistor, grounded the motor to another part of the truck and the fan worked on all speeds but high. Need help figuring out the issue with the ground wire now.

  •  Stephen
    Stephen Jan 13, 2013

    So the bad ground probably caused the wire from the fuse to burn. You should be able to run a new ground wire to any solid metal source.

  • Faith Jones Jan 14, 2013

    I am confused. None of the fuses are burned. I can ground the motor to another area of the truck and the motor will run but the ground wire gets hot. It seems from your suggestion that I need to replace the ground. Where does the ground run? From the fan motor to where? Need detailed electrical diagram. Hopefully you can help.

  •  Stephen
    Stephen Jan 14, 2013

    I'm sorry for the confusion. You said the red wire was burned. That should be the hot wire from the relay to the main fuse. The purple wire from the relay goes to the blower and the black wire from the blower is the ground. I assumed since the red wire burned the fuse was damaged too. If the black or purple wire coming from the blower motor gets hot, the motor could be pulling too many amps and may need to be replaced. Wiring diagrams don't usually show you where ground connections are made. It probably goes back into the harness and connects with other black ground wires. You should be able to drill a small hole in the metal panel next to the door hinges and connect the black ground wire there.



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Posted on Jan 02, 2017


Robbie Pena

  • 375 Answers

SOURCE: 2005 gmc sierra...took blower motor

their is a blower motor relay in the fuse box under the hood more than likely your problem!

Posted on Jan 13, 2011


  • 1 Answer

SOURCE: 99 Yukon - Blower Motor Not Working

I went through the same thing with my 99 suburban. It turned out to be the dash fan control switch. It is purchased seperate from the whole cluster for under twenty dollars. The instrument panel cover comes off gently by hand with the tilt steering in the down position. You have to then unplug the electrical plugs to get it out of the way. The heater ac control panel then comes out by hand far enough to unsrew the heater fan control from the back.

Posted on Jan 24, 2009


  • 1 Answer

SOURCE: 99 Yukon - Blower Motor Not Working

replace the A/C control head... very simple to do. Pop off the dash panel and pull the control head out... unplug the 3 harnesses and there you go.

Posted on Jun 20, 2009


Bobby Memory

  • 258 Answers

SOURCE: 1996 GMC blower motor only works on high speed.

more than likely yes the resistor

Posted on Oct 22, 2009

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