Heater problems

1997 GMC C1500
170,000 MILES • V6 • 2WD
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SMOKE8310
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  • 12 POSTS
My heater stopped blowing heat out but once the truck heats up and I get going down the road doing 50mph pluse it pushes heat threw my vents like I had it set on low you can hear it switch from low to high but nothing comes threw the vents is it my blower motor
Feb 16, 2016 at 10:31 PM
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JOHNNYT73
  • ✓Experienced Mechanic
  • 924 POSTS
So, your blower motor is not blowing any air through the vents. Does it blow when on high or not at all?
Feb 16, 2016 at 11:18 PM
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SMOKE8310
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Blower does not blow
Feb 16, 2016 at 11:19 PM
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SMOKE8310
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Dont blow on any setting
Feb 16, 2016 at 11:20 PM
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JOHNNYT73
  • ✓Experienced Mechanic
  • 924 POSTS
Ok, first check your fuses and that you have power on both sides of the fuses.
Feb 16, 2016 at 11:20 PM
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SMOKE8310
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  • 12 POSTS
I hear it clicking when I switch my heat from low to high down by the blower already checked the fuses and power
Feb 16, 2016 at 11:22 PM
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JOHNNYT73
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  • 924 POSTS
Ok, then most likely it is the blower motor. I would replace the resistor and blower motor.
Feb 16, 2016 at 11:25 PM
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SMOKE8310
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  • 12 POSTS
In the off chance it's not that what else could it be
Feb 16, 2016 at 11:29 PM
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JOHNNYT73
  • ✓Experienced Mechanic
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The only other thing i can think of would be the HVAC control head
Feb 16, 2016 at 11:30 PM
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SMOKE8310
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Where is that located
Feb 16, 2016 at 11:31 PM
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JOHNNYT73
  • ✓Experienced Mechanic
  • 924 POSTS
thats what the unit is called on your dash with your buttons and such on it to control your HVAC
Feb 16, 2016 at 11:32 PM
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SMOKE8310
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  • 12 POSTS
Ok it's working so I will change the blower and resister thank you for your time you've been a huge help
Feb 16, 2016 at 11:35 PM
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JOHNNYT73
  • ✓Experienced Mechanic
  • 924 POSTS
your very welcome.
Feb 17, 2016 at 12:06 AM
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