Question about 1990 GMC Sierra

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Just replaced fan blower motor and its still grinding

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!!

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  • Master
  • 1,669 Answers

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

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emissionwiz
  • 76118 Answers

SOURCE: 1995 GMC Sierra Ext Cab

You need to replace the blower motor resistor

Posted on Sep 23, 2008

justuscc
  • 360 Answers

SOURCE: my blower motor only works on high

its the blower resistor next to the blower motor rate as fixya thanks justuscc

Posted on Oct 22, 2008

samson-1
  • 153 Answers

SOURCE: 02 GMC Sierra-heater-a/c motor only works on high speed

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

ministock48
  • 258 Answers

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

more than likely yes the resistor

Posted on Oct 22, 2009

Molson02536
  • 3854 Answers

SOURCE: blower motor for interior fan only blows on high

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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