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Chevrolet Impala, Sedan
#1 of 20 Knocking noise under dash
May 18, 2009 (3:02 pm)
I have 2006 impala, when running the air after i turn off the car i hear a knocking noise under the passenger side dash, any ideas what it could be.
#2 of 20 Buzzing under the dash
May 22, 2009 (12:23 am)
When it is damp outside, my 2007 Chevy Impala when you use the signal lights it has a buzzing sound under the dash each time the signal light flashes, it does it right or left.
#3 of 20 Re: Knocking noise under dash [robert220]
Sep 16, 2009 (7:08 pm)
I have a 2007 Impala and after turning off a/c, knocking noise for about 30-45 seconds. I looked behind the glove box and saw this white box going up and down after turning off the a/c. Repair shop said it's an Actuator that's tied into the lend door that controls the air/heat. Got it repaired w/ parts/labor for $200. Hope this helps.
#4 of 20 clicking/clunking of air conditioner 2007 impala LT
Nov 01, 2009 (7:54 pm)
I have a 2007 Impala and after turning off or turning the a/c, knocking noise for about 30-45 seconds or more. i opened up the glove box and removed some papers that were blocking the air flow.
And of course this noise only happens every now and then but when it does. wow is it annoying.
so of course when i finished cleaning out that area it didnt make any noises. which i figured that fixed the problem....but it didnt.
it continues again. and this sound shifts from driver side to passenger side. sometimes though.
so what should i do?
#5 of 20 Re: Knocking noise under dash [djf5]
Aug 30, 2011 (6:52 pm)
Hello, I was trying to find out where the acuator is located because my car is doing the same thing and I was told by the dealer that it sounds like an acuator but it would cost me 7 or 800 dollars to fix. Any suggestions
#6 of 20 A/C knocking noise switching from recirc to outside air
Sep 13, 2011 (9:26 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 (12:07 pm)
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 (12:09 pm)
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 (6:45 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 (1:13 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.