Question about 2005 GMC Sierra 1500 Hybrid

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How to find what is wrong with a blower motor on a gmc sierra 2005 the high speed fan will not work, all other speeds work

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Replace the resistor pack near the fan motor.

Posted on Jul 07, 2009

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Probably a bad resisiter in the plenum

Posted on Jul 02, 2009

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1 Answer

I installed new resistor and connector and speed 5 won't work on blower on 2005 gmc sierra


High speed on the blower fan does not work thru the resistor.
There is a seperate circuit that sould feed 12 volts directly to the motor. If you have access to a schematic it would help.
The connectors for the high speed, burn out a lot. If you cant find I could look it up.

Oct 22, 2013 | 2003 GMC Sierra 1500

2 Answers

Only high speed works on fan motor


This condition is caused by a defective blower motor speed control resistor. The resistor is located right next to the blower motor with the connector end sticking out of the ducting for the AC/Heater system. Very easy to replace and the part is cheap as well.

Jul 06, 2012 | 2002 GMC Sierra 2500HD

1 Answer

My 2006 GMC sierra 1500 heater fan stopped working. It started about 6 months ago when the high speed stopped working, now none of the speeds works.


This is your blower motor regulator. It is under the glove box and behind the blower motor itself. They are cheap to purchase but a pain in the rear side to replace. Hope this can help you out sir.

Feb 25, 2011 | GMC Sierra 1500 Cars & Trucks

1 Answer

2005 gmc sierra heater fan quit working. I lost the fifth speed months ago and a couple of days ago lost the other four, the first day the fan would come on sometimes while driving then quit after a while...


1-4 speed are the blower motor resister . It controls all 1-4 speeds, also it's under the passanger side dash around fan, the 5th speed runs off a fuse the is located in the fuse box. It's one of those square fuses , not the relays but fuses. The resister will run $15 and fuse $5 . Good luck. I have replace these before

Jan 03, 2011 | 2003 GMC Sierra 1500

1 Answer

2005 GMC Envoy XL High Speed Blower not working


if the other speeds work it is probably the blower resistor; if applies varying resistance to the voltage running the blower; this allows the fan to run at different speeds; should be located very close to the blower motor; behind a panel under the passenger side of the dash

Jun 27, 2010 | 2005 GMC Envoy Xl

1 Answer

2004 GMC Sierra 4dr truck. the fan does not work


The switch or the wire harness at the blower motor has gone bad. The highest setting 5 has no resistor, so the blower runs on high but the high current flow ends up burning up the switch's contact on that setting or the resistor wire harness at the blower motor has gone bad. Common would be the switch it self, if the switch is good. Then it's going to be the wire leads at the speed resistor by the blower motor under the glove box by the passenger leg compartment. Keep me posted, be glad to help you get your Sierra running 100% again soon.

Jan 06, 2010 | 2005 GMC Sierra

1 Answer

My blower fan only works on high


you will need to order a blower resister its easy to swap out

Dec 11, 2009 | 2000 GMC Sierra

4 Answers

1998 GMC Sierra pickup truck cabin fan problem


Your blower moter is under your glovebox and very easy to replace.I dont think thats your ploblem.I would pull off the dash.It will snap right off without breaking anything.Then pull out the part that holds the selector switch for the fan speed.Then you unplug that switch.Clean the copper contacts.Plug it back in.If everything works again like it should and did in my truck then it is either that switch that is bad or the wiring harness.I would replace that switch.

Oct 20, 2008 | 1998 GMC Sierra

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