A/C blows cold out vents then starts blowing in the dash

2011 CHEVROLET TAHOE
250,000 MILES • 5.8L • V8 • 2WD • AUTOMATIC
Avatar
MISTY MARIE BARR
  • MEMBER
  • 1 POST
When my vehicle first cranks, it blows fine and cold. After about 15 minutes it will stop blowing out of the vents almost completely and sounds like it's blowing in the dash. My husband is a heavy equipment mechanic but this one stumping him.
Apr 11, 2022 at 7:02 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
JACOBANDNICKOLAS
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

The problem sounds related to the mode door actuator. This actuator is what is responsible for airflow direction.

By chance, are there any sounds when this happens such as clicking or ticking?

The mode door actuator is under the dash and mounted on the HVAC unit. I attached a pic below showing its location. Start by checking the connector to it. Make sure nothing has come loose, is damaged, and the connection isn't corroded.

Let me know what you find.

Joe

See pic below.
Image (Click to enlarge)
Attached Media
Apr 11, 2022 at 8:46 PM
Advertisement