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dman001948 05-21-2018 10:45 AM

Knocking sound under the dash.
I have a 2011 Nox LTZ 4cyl that has a knocking sound coming from under the dash...I have been told its one of the actuators under the dash.

How would I know which one is bad? And how do I replace it?

I have been told one must remove the dash to get to it (Them) or through the glove box.

Just how to you remove the dash and is it hard and time consuming?


zora 05-21-2018 11:45 AM

Re: Knocking sound under the dash.
you can tell which one is bad by listening to it, below is one of many videos available on how to change it

dman001948 05-22-2018 10:53 AM

Re: Knocking sound under the dash.
Thanks, I have been playing around with it. And when I push the defrost button the noise goes away...and the a/c blows out of the defrost I guess thats one down...hahaha

Again Thanks

leonald 05-30-2018 09:50 PM

Re: Knocking sound under the dash.
Here's another video on how to replace the actuator--

dman001948 06-05-2018 09:04 AM

Re: Knocking sound under the dash.
Thank You.

dman001948 06-11-2018 04:49 PM

Re: Knocking sound under the dash.
It was the mode actuator, the one on the top, and the hardest to get to...I had the dealer do it....

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