HVAC Vent controls

Tiny
JIM2002
  • MEMBER
  • 2002 GMC SONOMA
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 102,000 MILES
I am having trouble with the Defrost/Feet/Vent/AC control. It is a 2002 GMC Sonoma with ZR5 Package. When I go to put the air to blow on my feet or defrost nothing happens. I can turn the switch over to the AC mode and it will start blowing cold air. It still comes out the 4 vents (face). It only blows out of the 4 vents that point at my face. It will switch to AC and the AC works fine but it still only comes out of the 4 vents on the dash by my face. I use to be able to hear it switch and I no longer even hear it trying to switch.
Any ideas as to what is wrong?
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Wednesday, February 25th, 2009 AT 8:52 AM

7 Replies

Tiny
SERPENTRACER
  • MEMBER
  • 34 POSTS
Hello,

There is a mode blend door actuator that sounds like it is not working correctly here is a guide to help you fix the problem.

https://www.2carpros.com/articles/replace-blend-door-motor

Please run down this guide and report back.
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Saturday, February 28th, 2009 AT 7:22 AM
Tiny
WIBRACKENS
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  • 0 POST
Thank you for this post I had this problem and had to replace the mode actuator cost me $64.00 all fixed I love this site.
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Tuesday, November 12th, 2019 AT 11:26 AM
Tiny
SLV123
  • MEMBER
  • 1 POST
  • 2001 GMC SONOMA
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 36,000 MILES
I am getting all the heat through the top vents OR the defrost and it wont blow out on the floor! Can you help?
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Tuesday, November 12th, 2019 AT 11:27 AM (Merged)
Tiny
ROBBIET
  • MEMBER
  • 8 POSTS
Sounds like you likely need to check your vacuum hoses for cracks and breaks. Can't tell u where they all are, but you'll have to poke around unless the dealer can give you a schematic printout of where they run.
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Tuesday, November 12th, 2019 AT 11:27 AM (Merged)
Tiny
TROYLEBLANC
  • MEMBER
  • 2 POSTS
  • 2000 GMC SONOMA
  • 6 CYL
  • 4WD
  • AUTOMATIC
I have a 2000 GMC Sonoma, and I can't get any heat, but the heater cord is not plugged. Wondering if something turns it from hot to cold.
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Tuesday, November 12th, 2019 AT 11:27 AM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the thermostat if okay inspect the air blend door if its in the heat position
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Tuesday, November 12th, 2019 AT 11:27 AM (Merged)
Tiny
TROYLEBLANC
  • MEMBER
  • 2 POSTS
How do find that
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Tuesday, November 12th, 2019 AT 11:27 AM (Merged)

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