Question about 1990 GMC Sierra
It stopped working so i changed the motor. got the replacement part put it in and it started grinding on high then i turned it to medium and it didnt grind so i used it on medium when i went to work but then after i got out of work it was grinding again. so i dont know what to do. Help!!
Perhaps it's not the motor itself, but the cage fan. If it is not mounted correctly on the motor shaft away from all things that might touch it. Also, if the motor was not put back at the right angles it will push the fan against its surroundings. Last idea is that the vent hose is touching the fan.
Posted on Jan 23, 2013
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Posted on Jan 02, 2017
Check or have checked the blower motor resistor. These resistors will cause this problem. I would go this route first as these are relatively inexpensive and usually the problem.
Posted on Dec 14, 2008
The blower resistor pack needs to be replaced, it's common for the blower speed resistors to burn up and will need to be replaced. It's easier to replace with the glove box out of the way. gmparts direct has the harness and resistor as a package deal. Their part number is PK15218254.
GM Parts list:
Resistor - p/n 15218254 $8.59*
Connector - p/n 15306069 $30.70*
Wiring harness - p/n 89019124 $20 *
You don't need to remove the glove box, just lay on the floorboard and look up under the dash. There's a 4-wire harness plugged into the resistor assembly (white plastic), in the bottom of the black heater blower shroud. Unplug the harness, remove two small screws, and pull down to remove the resistor assembly.
Good luck and merry xmass.
Posted on Dec 15, 2009
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