Question about 1991 GMC Sierra

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My 2002 GMC Sierra blower/A/C keeps running even with the engine off. I removed the A/C Fuse and it stops. Do i need to replace the Blower Motor Control Module and if so were is it.

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If the Blower is staying on high maximum blow then it is probably the a/c blower relay. The other thing it could be if not on maximum is the blower motor resistor pack. Lastly would be the blower switch shorted to power.

Posted on Oct 10, 2010

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Start the engine and let it to run for a few minutes to allow the air to cool. Double check the controls to make sure the correct buttons are selected. This may seem simplistic, but human error could be to blame.

  • 2 Adjust the climate controls. If they are working correctly with the right amount of resistance and stopping at the right places but have no effect on the air then it is probably a simple fuse problem. If they are not working correctly then it is probably a control panel issue.
  • 3 Get to the fuse box to change the blown fuse in a GMC Sierra by opening the driver's side door and prying off the trim panel to the left of the steering wheel. The fuse can be removed with your fingers. If the Sierra was purchased new there should be replacement fuses in the fuse box.
  • 4 Check the control panel next in your GMC Sierra. Remove the trim plate bezel surrounding the center instrument panel. Pull of the storage tray and the accessory switch.
  • 5 Unscrew the four screws holding the climate control assembly in place, push in the retaining tabs and pull the control panel out. Unplug the electrical connector. Sierra models older than 2001 have no retaining tabs or accessory switch.
  • 6 Listen for the blower motor while the engine is running and the air is on. There are two different possible blower motors in a GMC Sierra. Both are easily accessed from under the hood. The Delphi will sit vertically, while the Visteon sits horizontally. In both cases, remove the sound insulation panel, unplug the electrical connector and unscrew the three screws holding the blower motor into place.
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    The front blower motor is controlled by the blower resistor module.This is usually the problem with the front blower not working.I looked up the schecmatics and I don`t see separate fuses for the front and rear.But the fuse for the front blower is in the under hood fuse block.If this is good then The problem is probably the resistor module.It is next to the blower motor.The connector from the resistor connects to the blower motor.If you want to confirm this you can check for power and ground at the blower motor connector when you activating the blower switch on.This can be done with a test light.Make sure you have power going into the resistor module also.If you have power going in and no power at the blower motor then replace the resistor.Hope this helps.Good luck.

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