Dashboard Air flow not coming through the front driver and passenger vents

Tiny
MHUTTON4
  • MEMBER
  • 2008 CHEVROLET SILVERADO
  • 4WD
  • AUTOMATIC
  • 211,000 MILES
Air flow strong through defrost and side window vents, however not coming through the front driver and passenger vents.
Friday, July 1st, 2022 AT 12:46 PM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

It sounds like you could have a faulty mode door actuator.
The mode actuator is what controls where the air will blow from. These can go bad and get stuck in one position.
The mode door actuator is located on the HVAC box behind the dash

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

I have attached the diagrams below for your reference.

Let me know of any questions.
Thank you.
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Friday, July 1st, 2022 AT 3:14 PM

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