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1997 GMC Sonoma fan motor

Tiny
JOEDB
  • MEMBER
  • 1997 GMC SONOMA
  • 4 CYL
  • 2WD
  • MANUAL
  • 160,000 MILES
My '97 GMC Sonoma blows cold air, but, it only blows through the floor and dash outlets as if it was set on defrost. The fan will blow at all speed settings but will not blow through the dash air vents no matter what you set it on, (A/C, max A/C, fan, defrost, or defrost/heat) I've checked 3 of the 5 vacuum hoses and they appear to be fine. The other 2 and I have not been able to locate. I have found no blown fuses or relays. Please advise what this could be and how to fix.
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Monday, July 5th, 2010 AT 7:39 PM

7 Replies

Tiny
RICHZOMBIE
  • MECHANIC
  • 173 POSTS
The blend door may be stuck / bad and not allowing air to change flow to get to other vents. Only way to check is to go into dash and inspect the blend doors and other HVAC components.
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Monday, July 5th, 2010 AT 7:42 PM
Tiny
JOEDB
  • MEMBER
  • 7 POSTS
I recently bought the truck and when I test drove the truck the air vents worked, BUT, the previous owner did leave the hood unlatched and it flipped up and DESTROYED the windshield( I got a new windshield out of the deal), could it be possible that some small pieces of glass could be trapped in there causing the problem.
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Monday, July 5th, 2010 AT 8:01 PM
Tiny
RICHZOMBIE
  • MECHANIC
  • 173 POSTS
If they worked when you test drove it then that probably is not it
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Monday, July 5th, 2010 AT 8:18 PM
Tiny
JOEDB
  • MEMBER
  • 7 POSTS
The test drive took place before the windshield was busted. I told him I would possibly buy the truck, then he had the mishap. So he replaced the windshield before I bought the truck.
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Monday, July 5th, 2010 AT 8:24 PM
Tiny
RICHZOMBIE
  • MECHANIC
  • 173 POSTS
Oh ok, then yes that would definitely seem like a piece of the puzzle. I'm sure there are pieces of glass either in the cowl area (outside of car, below bottom of windshield) or some may have even fallen into the defrost vents.
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Monday, July 5th, 2010 AT 8:33 PM
Tiny
JOEDB
  • MEMBER
  • 7 POSTS
Why thank you Mr Zombie. I will look into that the next chance I get. Hopfully I can get to the problem without getting too far into the dash removal process. You think my shop vac will get the job done?
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Monday, July 5th, 2010 AT 8:50 PM
Tiny
RICHZOMBIE
  • MECHANIC
  • 173 POSTS
I'd say that would definitely help a lot at the very least, they are pretty powerful.
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Monday, July 5th, 2010 AT 9:00 PM

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