Jun 9, 2026 at 2:33 PM
Blend Door Actuator?
2007 CHEVROLET TRAILBLAZER
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STRAILER
- ✓ASE Certified Mechanic
- 54,832 POSTS
Use 2CarPros anytime, we are here to help.
STEVE W.
- ✓ASE Certified Mechanic
- 15,200 POSTS
No problem. We are very familiar to the "When I have time" situation.
Jun 9, 2026 at 5:47 PM
Sorry for the delay in getting back to this. I was traveling and had some health issues. However, I was able to use a snake camera to verify that both temp blend doors (both drivers and passenger sides) seem to be opening and closing normally when I adjust the temp slide controls. However, the air on the drivers side is still noticeably warmer than the air on the passenger side. However, the cool air on the passenger side seems to not be as cool as it was when this problem first surfaced. One other symptom: sometimes when the AC first kicks on I hear a thump behind the passenger side dash. Any other ideas of what could be causing this issue?
Jul 22, 2026 at 8:00 PM
STRAILER
- ✓ASE Certified Mechanic
- 54,832 POSTS
You might have something stuck in the blend door area such as a coin or pen which does not allow the blend door to close fully. Can you use your camera to check for this?
Jul 24, 2026 at 2:06 PM
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