HVAC Vent controls

2002 GMC SONOMA
102,000 MILES • 6 CYL • 4WD • AUTOMATIC
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JIM2002
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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?
Feb 25, 2009 at 8:52 AM
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SERPENTRACER
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  • 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.
Feb 28, 2009 at 7:22 AM
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WIBRACKENS
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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.
Nov 12, 2019 at 11:26 AM
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SLV123
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i am getting all the heat through the top vents OR the defrost and it wont blow out on the floor! can you help?
Nov 12, 2019 at 11:27 AM (Merged)
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ROBBIET
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  • 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.
Nov 12, 2019 at 11:27 AM (Merged)
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TROYLEBLANC
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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.
Nov 12, 2019 at 11:27 AM (Merged)
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RASMATAZ
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Check the thermostat if okay inspect the air blend door if its in the heat position
Nov 12, 2019 at 11:27 AM (Merged)
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TROYLEBLANC
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how do find that
Nov 12, 2019 at 11:27 AM (Merged)