Chattering blend door actuator?

Tiny
EZEX
  • MEMBER
  • 2009 CHEVROLET IMPALA
  • 3.9L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 110,000 MILES
My car just started making loud chattering noises which seem to be tied to the A/C. It stops for a bit when I adjust it. I'm assuming that it's the blend door actuator as I know it's a known problem area on this car. How do I determine which one it is and how do I access/replace it?
Sunday, July 24th, 2022 AT 6:59 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,601 POSTS
You must locate the blend door actuator that is making noise and then replace it, this is a common problem. You can do this by putting your hand on the actuator in question. Here are the locations and how to replace it in the diagrams below:

Actuator Recalibration

Calibration Procedure

Use the following steps to perform the calibration update:

1. Install a scan tool.
2. Turn ON the ignition, with the engine "off".
3. Select HVAC Control Module
4. Select Special Functions
5. Select recalibrate All Motors
6. Select "on", wait 60 seconds.

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Monday, July 25th, 2022 AT 10:19 AM

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