Question about 2003 GMC Sierra 1500

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2005 GMC Sierra heater/ac fan won't turn on. Change the tempurature moduler and it started to work. Now it will come on sometimes and other times not at all. I have check the blower motor and it i

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Posted on Jan 02, 2017

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SOURCE: need to know where the heater blower motor

Unless they moved it and are still using the same part,I would say that this one is located behind the glove box sandwitched between the underside of the dash and the top of the airbox.The blower motor is mounted to the underside of the airbox.

Posted on Jan 04, 2010

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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

  • 1 Answer

SOURCE: 2003 GMC Sierra heater Blower wont shut off

My 2003 Sierra's blower came on by itself in the garage while I was sleeping and ran the battery completely down. I had to replace the blower switch located under the glove box next to the blower at the bottom of the right corner of the dash. The switch is in front of the blower and held in by two screws. Disconnect the two wire connections. This is a "dealer only" part and cost me 65.00. Also check the wire harness with seven wires connected to it for melted plastic. It will be marked "ABCDEFG". If it has melted, you'll need to replace it. Pay attention when reinstalling either part, that the wires "ABCDEFG" match the switch in that order.

Posted on Jan 17, 2009

  • 1 Answer

SOURCE: 2005 GMC Sierra blower wont turn off

www.motorcity1.com This web site is all you need, it explains everything.

Posted on May 13, 2009

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SOURCE: 2005 GMC Sierra 1500 - heater blows, but only cold air

Check coolant level. Check for heat at the heater hose going from water pump to heater core at firewall. Check to see that cable is moving coolant control valve from the closed to open position. Low mileage so it shouldn't be plugged heater core.

Posted on Jan 07, 2010

Testimonial: "You were absolutely correct. Low coolant level. Put in some 50/50 and we're nice and toasty now, but need to find out why coolant was so low. Thanks."

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1 Answer

Where is the fuse for the heater located in a 2008 gmc sierra


Do you have The Automatic or Manual HVAC system ? Doesn't matter fuse's are the same ! Out in the under hood fuse / relay box are two fuse's for heater HVAC BATT fuse #39 10 amp an # 70 40 amp . HVAC BLWR . HVAC = heater ventilation an air conditioning ! So Tom what problem are you having ? Heater fan not working ? There is also a blower motor control module involved !

Feb 09, 2015 | 2008 GMC Sierra 2500HD

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I have a 2005 gmc sierra 1500 2wd v6 automatic base model with ac.it will not start and when this happens the heater/ac fan will not work and also the horn.you turn the key and all the lights come on but...


Sounds like you need to find a good mechanic that can sort out your electrical problem. The items you mentioned are safety features that could potentially leave you stranded or dead if not resolved.

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Heater switch does not work in all setting's 1 to 5 on a 1996 gmc seirra truck


Problem need a heater/ac fan motor, which is around $25. If you still have problems then you need to replace the relay switch.

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Chevrolet Suburban Fan Won't Blow


check ac control unit if you replaced blower module and if your sure fan works

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Can't find relay for radiator cooling fan on 2005 GMC sierra


relays are located left end of the instrument panel.look inside owners manual in glove compartment, it has all fuses and relays locations.

Feb 08, 2012 | 2005 GMC Sierra

1 Answer

I have a 2005 GMC Sierra regular cab. 4.3 v6 The heater has only been blowing cold air. Checked coolant and replaced the thermostat. No change. AC worked fine this summer. Heat worked fine last...


sounds like you have a bad temperature door actuator. This is a motor that connects to the door and uses inputs from the sensor in itself and the heater control module to open the door from hot to cold. I does take some knowledge on recalibrating this actuator and installing it. if it isn't install correctly it could damage the new part, so just take care

Sep 16, 2011 | 2005 GMC Sierra

1 Answer

Replaced the battery on a GMC Sierra 2005. Turned AC on, it cooled for about a minute and started blowing hot air on the driver side, the passenger side blows cold. What does replacing the battery have to...


you have taken the calibration out of sink. you will now have to remove battery power again for about 5 minutes. after this time reconnect the battery. then turn key to on position for 3 minutes but do not touch the heater control or temperature controls. This should allow the heater and ac system to recalibrate. once the 3 minutes is up turn key off and then back on and start truck.. Try your controls again and see what happens. if no change then dealer will have to reprogram the heater control calibration for you.

Jul 18, 2011 | 2005 GMC Sierra

1 Answer

I have a 2005 Gmc Sierra. The fan doesnt work anymore and I checked the fuse and its fine. How hard is it to replace the relay?


When you say fan I assume that you are talking about the heater fan?? The fuse and relay are usually plug in modules. Fuses are usually under the dash and relays and some fuses are under the hood in a large black box on top of the drivers side fender. A description of fuses and relays is on the inside of the lid that you take off. If replacing them doesn't work then time for a new fan.

Nov 01, 2010 | 2005 GMC Sierra

1 Answer

2003 gmc seirra sle 2500hd 4x4 ext'd cab duramax diesel allison a/t #1 heater fan operates on hi w/switch on hi when engine is started, but will not in most cases when adjusted after engine is running???...


To reset the oil life......turn the key on....do not start....pump the gas pedal 3 times within 5 seconds.....then turn the key off and back on and it should be reset....sometimes u have to do it a couple times.......and what heater fan r u talking about?.....

Dec 30, 2009 | 2003 GMC Sierra

1 Answer

Blows hot and cold-restart and problem disappears for a while


you need a servicing of the ac condensor, also check that the blower is working or not. your problem will be solved by servicing the condensor.

Jun 20, 2009 | 2004 GMC Sierra

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