Blower fan not working

Tiny
JACOBANDNICKOLAS
  • EXPERT
Check to see if there is power to the blower motor itself. If there is, chances are the motor is bad.
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Saturday, December 26th, 2020 AT 10:12 AM (Merged)
Tiny
MIDKNIGHT
  • MEMBER
Thank you. Checked voltage, I have it. Going to replace motor and see.
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Saturday, December 26th, 2020 AT 10:12 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • EXPERT
Before you purchase a new motor, pull yours and run a jumper wire from the battery directly to it. That way you will be certain if the part is back. If you want, ask a parts store to check it for you. They have the equipment to check it.

Let me know what you find.
Joe
PS: If there is power to it, it should run. So, chances are it is bad.
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Saturday, December 26th, 2020 AT 10:12 AM (Merged)
Tiny
ALPHONSINE JONES
  • MEMBER
  • 2003 GMC SIERRA
  • 8.1L
  • V8
  • AWD
  • AUTOMATIC
  • 100,000 MILES
One day the blower motor just stopped working. All the speeds worked up to that point. I was going to change out the Blower relay but I cannot locate it in the vehicle. Although it exists because I have looked it up verified it with the auto parts store. So I moved on to the resistor, but the resistor that I purchased and that comes up for my vehicle is wrong. The one that is in my vehicle matches the one that is for a 2003 Chevrolet Tahoe (rear) but I do not believe it is the resistor anyhow. My only other guesses are the switch and the motor its self, but my first guess is still the relay. Could you please help?
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Saturday, December 26th, 2020 AT 10:12 AM (Merged)
Tiny
SATURNTECH9
  • EXPERT
The relay only operates the high speed setting the other speeds go through the resistor, so a bad relay would be a bad guess. Do you have a multi meter to do some testing?
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Saturday, December 26th, 2020 AT 10:12 AM (Merged)
Tiny
ALPHONSINE JONES
  • MEMBER
I could pick one up what do you suggest?
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Saturday, December 26th, 2020 AT 10:12 AM (Merged)
Tiny
SATURNTECH9
  • EXPERT
If you have a harbor freight around you they have metered cheap there sometimes with a coupon there even cheaper. Other wise were just guessing. You could try turning the blower on high and smacking the blower motor and see if it starts working.
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Saturday, December 26th, 2020 AT 10:12 AM (Merged)
Tiny
KEN L
  • ADMIN
Hey ALPHONSINE ,

You can test the blower motor using this guide here

https://www.2carpros.com/articles/blower-motor-testing

Let us know what you find

Best, Ken
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Saturday, December 26th, 2020 AT 10:12 AM (Merged)
Tiny
ROYHOBBS
  • MEMBER
  • 1997 GMC SIERRA
V8 four wheel drive automatic 180,000 miles.

No air coming out when fan switch is turned to any setting. Tried replacing the fuse (in cab) but did not work. Owner's manual says there is also a under hood blower fuse/relay which I have not replaced yet. Was working just fine yesterday and have had no problems with it before. Thanks for the assistance.
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Saturday, December 26th, 2020 AT 10:12 AM (Merged)
Tiny
BLUELIGHTNIN6
  • EXPERT
First check blower motor relay as your manual states. If okay then check your heater control switches. If they are okay as well then suspect faulty blower motor.
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Saturday, December 26th, 2020 AT 10:12 AM (Merged)
Tiny
ROYHOBBS
  • MEMBER
Thanks, I will try the other fuse but I currently do not have a service manual for this vehicle so not sure how to check the heater switches.
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Saturday, December 26th, 2020 AT 10:12 AM (Merged)
Tiny
BLUELIGHTNIN6
  • EXPERT
Your blower motor relay is located on top of the front A/C-heater blower housing, in dash.
Follow the link here to get an idea of how to test the blower motor relay.

https://www.2carpros.com/how_to/how_do_i_check_a_relay.htm
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Saturday, December 26th, 2020 AT 10:12 AM (Merged)
Tiny
ROYHOBBS
  • MEMBER
Thanks for the help, turned out to be the blower motor after all.
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Saturday, December 26th, 2020 AT 10:12 AM (Merged)
Tiny
HDLH883
  • MEMBER
  • 1995 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 88,500 MILES
Heater blower quit working after stopping to fuel up. Blower was working fine before shutting the engine down. When restarted the engine the blower would not come on and radio display would not light and no signal (although volume control raised and lowered the static).
When I shut the engine off and restarted the radio worked again.
I checked the fuses and AC relay under the hood which are all good.
When I turn the fan switch on I hear a click behind the AC/heat control panel but no blower.
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Saturday, December 26th, 2020 AT 10:12 AM (Merged)
Tiny
RACEFAN966
  • EXPERT
Sounds like the controller may be bad

read the guide on testing wiring first, it will help

https://www.2carpros.com/articles/how-to-check-wiring

The wiring diagrams for you blower are attached below
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Saturday, December 26th, 2020 AT 10:12 AM (Merged)
Tiny
BTOLER
  • MEMBER
  • 2007 GMC SIERRA
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 169,000 MILES
It will go off maybe a couple minutes then come back on, then blow a while and quit for maybe a half hour come back on for a couple days then quit for a while and come back on. It s getting more frequent. Help!
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Saturday, December 26th, 2020 AT 2:52 PM (Merged)
Tiny
SCGRANTURISMO
  • EXPERT
Hello,

Although the time has past by a couple of years for your vehicle, I have included a Technical Service Bulletin (TSB) for your vehicle for a recall for this very issue. You still might want to get in contact with the service department for your local dealership and see if they can't fix this at no cost to you under a customer retention goodwill policy. If not, the part numbers for the required parts and the instructions from the vehicle manufacturer on how to fix this problem is included in this TSB. Please go through this TSB and get back to us with what you are able to find out.

Thanks,
Alex
2CarPros
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Saturday, December 26th, 2020 AT 2:52 PM (Merged)

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