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A/C and Heater stopped working

Tiny
TAYLOR GREER
  • MEMBER
  • 2004 CHEVROLET TRAILBLAZER
  • AUTOMATIC
  • 200,000 MILES
The A/C and heater randomly stopped working during one of my drives. It was working fine and then just cut off. Now when I use the temperature switch I can feel hot or cold at my feet but nothing comes on when I turn the air flow knob.
Thursday, September 2nd, 2021 AT 11:07 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

Just to clarify, air comes only from vent by your feet?
If that is what's happening then it is likely the mode door actuator is faulty.
The mode door actuator control where the air comes out. ie; from the dash vent or defrost or floor vent.
That actuator is located in the HVAC box behind the dash.

https://www.2carpros.com/articles/low-or-no-air-flow-from-vents

I have attached diagrams for your reference.

Please let me know of any questions.
Thank you.
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Friday, September 3rd, 2021 AT 8:46 AM

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