Saturday, December 20, 2008
No Blower 1992 GMC Sierra
The blower motor on my 1992 GMC Sierra extended cab truck ran only on high for a few days, and then quit altogether. I bought a new resistor, but I cannot find the location of the existing one to replace it. I removed the glove box, but could not see anything that looked like the replacement that I got from the parts house. Can you help me out?
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6 comments:
It's been a while but I believe the blower resistor is actually on top of the evaporator assembly behind the glove box. It is however rare that they fail and if it did you should still have high blower. First turn your key on and set the blower to high, then check power and ground at the blower motor. If you have power and ground , bump the motor and see if it comes on. If there is no power check the three wire harness connector behind the glove box area. It is sometimes wrapped in foam. The red wire usually burns out here. There are also high and low blower relays located in this area. Email us back with your findings and we will provide more help if you need it.
Sparky
The Electric Connection
I have pulled the relays and held them in my hand while working the power switch. I can feel them and hear them working. Do the wires from these relays go to the resistor? Space is mighty tight behind the glove box around the blower motor. It is very difficult to get to the wires on top of the blower motor. There is a large aluminum “control box” of some kind right on top of the motor. I’ll check it out again and let you know.
Thanks Cliff
The large aluminum box is your engine control computer. Not terribly sensitive but respect it while handling. Yes, the wires are difficult to get to sometimes. You can check power for the blower motor at the purple wire on the high speed blower relay. There may be two wires in one terminal. Some of the relay wiring goes directly to the resistor. Did you find the harness connector withe the large red wire in it? I think it has three wires altogether.
Sparky
That’s what I figured about the box. I did not have time to do much after work yesterday. I did, however, get the blower to run by setting it on high and tapping it. Still nothing but the clicking of the relays on medium and low.
Cliff
That’s what I figured about the box. I did not have time to do much after work yesterday. I did, however, get the blower to run by setting it on high and tapping it. Still nothing but the clicking of the relays on medium and low.
Cliff
Good Morning Cliff,
Sounds like the blower motor is bad and it has probably damaged the blower resistor. Be sure to check the condition of the ground and power connections at the blower motor. In order to replace the motor the sound dampening cover has to be removed. To remove it without damage you will first need to remove the computer. After it is out of the way the cover and the motor are fairly simple to remove, screws and a couple of wires. I do not have an exact location or procedure for the blower resistor but I did look up the R&R time and the labor guide shows about 50 minutes. Keep me informed of your progress.
Sparky
The Electric Connection
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