Question about 2003 GMC Sierra 1500
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.
Posted on Oct 22, 2013
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
SOURCE: 2005 GMC Sierra 4x4 -
The blower motor resistor is a common to fail and cause your problem. It is located on the passenger side on the underside of the dash. There are two screws that hold it in and very simple to replace. Check the wiring and connectors that go to it. There is an udated version that you can buy if you notice any burnt look to it. The other wires go to the heater motor and will need to be unplugged. Just reinstall the new one and give it a shot.
Posted on May 11, 2011
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
More than likely this should just be your resistor. You have different sized coils on the back of your resistor for all the different fan speeds. if one of them burns out or breaks then that certain speed will not work.
Posted on Feb 03, 2009
There is an updated resistor/connector package. Very expensive from GM, try your local NAPA or other parts supplier for a replacement
Posted on Jul 09, 2009
Tips for a great answer:
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.
Oct 12, 2014 | 2005 GMC Sierra
Dec 08, 2011 | 2000 GMC New Sierra 1500
Aug 15, 2011 | 2005 GMC Sierra
Jan 13, 2011 | 1996 GMC Sierra
Oct 15, 2010 | 2005 GMC Sierra 2500HD 4WD
Jul 15, 2010 | 2005 GMC Sierra
Mar 04, 2010 | 2001 GMC Sierra Crew Cab
Jan 06, 2010 | 2005 GMC Sierra
Sep 18, 2009 | 2004 GMC Sierra
Jul 02, 2009 | 2005 GMC Sierra 1500 Hybrid
168 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: