Question about 2003 GMC Sierra

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

It has a choice of 1 thru 5 , and it only works on the #5 speed.
Please let me know if it's the blower motor and is it easy to replace.

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  • nelsonefig Dec 17, 2008

    Thanks for the input...

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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

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1 Answer

97 Gmc Sierra my heat only works on high heat sometimes or it doesn't work at all i changed the blower motor and it still doesn't work


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.

Feb 25, 2014 | Cars & Trucks

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

1 Answer

1995 GMC Sierra fan blower not working.


In the beginning you should check for voltage and ground.
The 50amp fuse marked AC powers the blower motor and the motor is grounded.
The high speed relay bypasses the resistor. So you should have power coming from the fuse and thru the high relay. Then the resistor for the other speeds gets power from the heat and ac control module which also controls the blend doors.
You may need a shop manual or repair book to get the diagrams.

Jan 12, 2013 | 1995 GMC Sierra C1500

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

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

05 GMC sierra heater blower stopped working. It used to work on setting 1-4 but lost 4 a couple weeks ago and now none of them work. Is this a bad blower , resistor or both?


The resistor is most likely bad but should still work on the highest setting.Would check pigtails to the resistor and to the blower motor for burnt or discolored wiring.You can try tapping the blower motor and wiggling the wiring harness too see if it will work on the highest setting. It is possible that the blower motor is bad as well typically when you lose the speed selection it is the resistor but you should always have high speed.

Nov 10, 2010 | 2003 GMC Sierra 1500

1 Answer

Heater fan blows in position 3,4,5 but not 1 or 2


the blower motor resistor is fried...it is located under the dash, passenger side, costs about 10 bucks and takes 5 mins to install...happened to me, it needs to "resist" or limit the power for lower speeds, that's why it works in 3-5, no resisting needed.

Mar 03, 2010 | 2002 GMC Sierra

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

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