You should have a high speed blower relay that provides power on high, and the other speeds go thru a resistor.
The problem could be the actual fan control switch, or the resistor.
SOURCE: 2004 gmc sierra 1500 blower motor location
The blower motor is on the passengers side under the dash.You might have to remove the a lower panel.This is the insulator panel.If the blower works at all just turn it on and follow the noise.Hope this helps.Good luck.
SOURCE: heater blower motor works intermittently
I would replace the blower motor, this sounds like a motor brush problem inside the motor itself.
SOURCE: my 1998 astro van blower motor only works on high speed.
No the motor is not bad or going bad, the heater blower motor resister is bad, thats regulates the blower speeds, its located under dash by heater motor 2 screws hold in heater box with a electrical plug to it.
Wiring problem of the 2005 GMC Sierra 1500 6
Failure Date: 07/18/2009
The connector that plugs into the blower motor under the glove box became too hot and melted the plastic resulting in the a/c and heat not to work (this includes the windshield defroster). I've been looking up problems and solutions and found that this is a recurring problem with GMC and chevy trucks yet there has not been any recall, in fact the dealerships have an extremely overpriced kit to fix their faulty wiring. About 66,000 mi.
169 views
Usually answered in minutes!
×