2008 Impala noise from AC/Heater - Automotive Wiring and Electrical


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2008 Impala noise from AC/Heater

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2wonder
User

Aug 19, 2015, 3:22 PM

Post #1 of 3 (1317 views)

2008 Impala noise from AC/Heater	Sign In

My 2008 Impala with 100k miles has just started making a noise from inside at the heater unit around the passenger foot area. It sounds like the fan is hitting something or the door opening and close device is not working correctly.

If I have just the heat or airflow on or turned off, it makes the noise unless I change the vent selection from say floor to dash. Then the noise stops but just for a few seconds and returns.

If I have the AC on, no noise until I turn of the AC or turn the car off, then the noise returns.

When the car is turned off the noise is there until the delayed electrical features such as lights go off.

Is this an electrical problem or an issue with the units air flow door mechanism?

Any ideas on how I can fix this????

Discretesignals
Ultimate Carjunky / Moderator
Discretesignals profile image

Aug 19, 2015, 5:40 PM

Post #2 of 3 (1305 views)

Re: 2008 Impala noise from AC/Heater	Sign In

Could be a mode door actuator gone bad. You'll need to get under the dash with a flashlight and try to pinpoint exactly where the noise is originating.

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Aug 19, 2015, 5:41 PM)

2wonder
User

Aug 27, 2015, 4:57 AM

Post #3 of 3 (1278 views)

Re: 2008 Impala noise from AC/Heater	Sign In

Thanks, it was a door actuator. I found an excellent utube video on how to replace it and did the repair myself.

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