Question about 1999 GMC Sonoma

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The heater control does not switch from the floor to the dash. It's stuck on vent. What part does it take to fix the problem? Is it just the control knob?

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It is probally in the heater box behind the dash. It is controlled by vacuum line

Posted on Sep 26, 2009

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Posted on Jan 02, 2017

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SOURCE: my vent is stuck on floor position and heater

The thing to do is check for vacuum leaks. In the engine bay look for any "hoses" coming from the firewall. These are for the heater contols. If any of these are broke? Replace them . Have you installed a after market radio? Sometimes heater controlls get messed up. I would take the radio out and examine the heater controlls.

Posted on Jan 10, 2011

  • 67 Answers

SOURCE: my dash knob that controls defrost/feet,

remove switch wires fried

Posted on Mar 30, 2010

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2 Answers

1998 chevy blazer heater problems. wont switch from defrost to floor. stuck on vents right now. how do I fix this problem.


Most likely either the vent switching mechanism is dirty and won't switch the flaps -or- most likely the vacuum that is used to turn the vent flaps is either leaking and not pulling enough vacuum. You will have to get underneath the dash near the center, to check and see if you can manually move the vent flaps. If so, then most likely it is a vacuum leak in a vacuum line to the flap mechanism.

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I have a 2003 Trailblazer and the dash vent is stuck on. When I try to switch it to the floor vents or the defrost it will start making a clicking noise and will not stop until I switch it back to the...


There are actuators,(little motors) that control air flow direction and temperature control. They contain plastic gears that are know to strip.the mode actuator in your vehicle requires the removal of the dash to replace according to ProDemand. I would suggest getting a professional to scan for trouble codes and advise.

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I have a 2003 Trailblazer and the dash vent is stuck on. When I try to switch it to the floor vents or the defrost it will start making a clicking noise and will not stop until I switch it back to the...


There are actuators, (little motors) that control air flow direction and temperature control. They contain plastic gears that are know to strip.the mode actuator in your vehicle requires the removal of the dash to replace according to Pro Demand. I would suggest getting a professional to scan for trouble codes and advise.
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THAT HAS NOTHING TO DO WITH A HEATER CORE IF CORE IS GOING OUT IT WILL LEAK THATSOUNDS LIKE AN ACTUATOR ACTING UP OR VACCUUM LINE LEAK BEHIND DASH

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The thing to do is check for vacuum leaks. In the engine bay look for any "hoses" coming from the firewall. These are for the heater contols. If any of these are broke? Replace them . Have you installed a after market radio? Sometimes heater controlls get messed up. I would take the radio out and examine the heater controlls.

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