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Username Post: 07 Impala LS knocking noise under dash        (Topic#257994)
Forum Newbie
Posts: 1

Reg: 02-21-11
02-21-11 07:03 PM - Post#2050079    

I have a 2007 Impala LS, 35K miles. I bought it used last month. When I first got it, and used the heater, a couple of times, a knocking noise would start up under the dash board, passenger side, right in front of the passenger seat. It would last a few minutes, then stop.

Fast forward to last Thursday, I had to replace my battery. Now, every time I start the car, or even use my remote keyfob to unlock the doors, the same knocking noise starts up. It last a few minutes, then stops. I've tried to see if having the climate control set to cool or hot, makes no difference.

I don't know what to try or even where to begin. Any help would be greatly appreciated.


Chevrolet Customer Service 
Posts: 213
Chevrolet Customer Service
Reg: 07-05-10
03-02-11 12:35 PM - Post#2054690    
    In response to Bluefox75

I apologize for not responding sooner. I was wondering if the issue has been taken care of?

Thank you,
Caron, GM Customer Service

>>>>>> Please check out the new Chevrolet Owner Center at for more vehicle information!

For information on the GM Privacy Statement, please visit

Old as Dirt Member
Posts: 6223
Loc: West Covina,CA
Reg: 03-29-00
03-04-11 01:37 PM - Post#2055770    
    In response to Chevrolet Customer Service

is it a loud fast clicking?
Most likely the vent door actuators.
Ive already replaced one on my 07 Impala.
You just have to order the part.
Little teeth break on the gear inside and causes the popping.

heres a video.

2010 Traverse
2008 Buick Lucerne CXL
2007 Impala 3LT
2003 Trailblazer-152,500 miles
1970 Monte Carlo
1964 C20
1967 Nova


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