A/C and Heater stopped working

2004 CHEVROLET TRAILBLAZER

200,000 MILES • AUTOMATIC

TAYLOR GREER

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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.

Sep 2, 2021 at 11:07 PM

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SQM

AUTOMOTIVE REPAIR CONTRIBUTOR
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.

Images (Click to enlarge)

Sep 3, 2021 at 8:46 AM