Last post on Sep 14, 2012 at 4:35 PM
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Chevrolet Impala, Sedan
#6 of 20 A/C knocking noise switching from recirc to outside air
Sep 13, 2011 (8:26 pm)
Having the same thing going on with my 2008 Impala LS at 42,000 miles. If I turn the fan speed up (with the outside air option LED lit) and press the snowflake (to kick on the compressor) it doesn't make the knocking noise. Switch the air from outside air to recirculate and I hear the knocking noise from under the dash. Eventually the noise stops (after 30-45 seconds). When I turn the fan speed back to Lo, the knocking noise returns (probably because it's switching back to outside air). It's probably the actuator. Spoke with one of my neighbors who mentioned having that problem on a Chevy pickup.
Already had the steering issue/bumping noise when you accelerate/decelerate. Thankfully, that was fixed under warranty.
Last year I had the problem where I had no heat the first cool spell. That ended up being another trip to the shop.
Just today I ran into the alignment problem/premature tire wire.
#7 of 20 Re: Knocking noise under dash [robert220]
Sep 16, 2011 (11:07 am)
My 07 is doing the same thing. I was told it is the arm control valve. Though it is annoying it's not a major problem. If I am wrong please let me know, I hope to be able to wait a while to get mine repaired.
#8 of 20 Trunk release
Sep 16, 2011 (11:09 am)
My 07 Impala's trunk release inside the car and on my remote has stopped working. I did not realize that there is not a key spot on the outside of the car as a back up. Any ideas what is the problem?
#9 of 20 Re: Knocking noise under dash [robert220]
Oct 06, 2011 (5:45 pm)
Knock knock, tic tic, knock knock! Wow so you have heard this as well? So glad you did because you see I took my car my 2008 Impala back to the dealership I bought it from Sikeston Autry Morland, and the service manager told me i had a problem with my battery, that once that was replaced I wouldnt hear this noise...I argued with him till I was yelling and blue in the face! Telling him there is no way this was my battery! I purchased a new battery took the car back up to him and since I belittle and ashamed him I was kicked off the premises. Now my car is at a different location being fixed....
#10 of 20 Re: Knocking noise under dash [ctaylor63801]
Oct 09, 2011 (12:13 pm)
Gosh, hated that you had to spend money on a battery. My only does it when I turn off the ac, my husband says it the control shutter door (something along those words lol) if I turn my ac back on it stops. I have used my heater a little and it does not do it at all. Unless you are using your ac all year, I would probaly wait to get it fixed.
Oct 09, 2011 (12:16 pm)
I got my trunk fixed, after I had several people it was going to cost quite a bit to fix it. My husband pulled the fuse out and replaced it with a new one. The trunk and remote are both working fine now.
#12 of 20 Re: Knocking noise under dash
Dec 09, 2011 (5:02 pm)
My Pontiac Vibe started making a clacking noise (about 2/sec.) but stops when I turn off the outside air. The A/C is off. When I stop 'Inside Air' so it brings in fresh outside air, it takes about 5 seconds and the clacking noise starts again.
#13 of 20 Knocking Noise Under Dash
Mar 05, 2012 (7:06 pm)
My mechanic immediately diagnosed, "Actuator!" when I described the knocking noise under the dash of my 2006 Impala. He recommended waiting until the heat/air no longer works before springing for the repair, and explained it won't be a cheap fix -- about $500 "because the dash has to come out". Although the racket is annoying, it only occurs when I turn off the engine -- and not every trip -- and usually winds down by the time I've climbed out and locked up.
#14 of 20 Re: Knocking Noise Under Dash [elkparkerjmp]
Mar 18, 2012 (10:30 pm)
In the Impala all the mechanic has to do is drop down the glove box door and the actuator is right there and held on by 3 6mm screws very easy fix!
#15 of 20 Re: Knocking Noise Under Dash [daves95maxima]
Mar 23, 2012 (6:09 am)
Thanks for the info! Definitely not spending several hundred $ to fix a 60 second noise and then it stops.