Impala Forums banner

21 - 39 of 39 Posts

·
Registered
Joined
·
11 Posts
Help. Ac making knocking noise

I have a similar problem. I just bought a 2007 impala lt with the 3.5 L v6. There is no problem with the ac when its on but when I turn it off it makes a knocking noise from the passanger side for about 30 sec then stops. It ony does it after turning off the ac or vehicle. I was looking this up but saw a couple different answers. Can any one tell me what this could be and explain to me how I can fix it? Sorry for asking again if already answered but im still having trouble with this any help would be greatly appreciated.
 

·
Registered
Joined
·
10 Posts
Mine just started doing that as well. I just had the drivers side servo replaced with the same exact problem, except it would additionally grind for awhile after I turned the car on.

When I brought it to the dealership, they said the servo was getting stuck in the on position, which actually drained and killed my old battery.

Previously, it was the blend doors, but I think the problem now is whatever actuator switches from windshield to passenger vents.
 

·
Registered
Joined
·
5 Posts
I have a similar problem. I just bought a 2007 impala lt with the 3.5 L v6. There is no problem with the ac when its on but when I turn it off it makes a knocking noise from the passanger side for about 30 sec then stops. It ony does it after turning off the ac or vehicle. I was looking this up but saw a couple different answers. Can any one tell me what this could be and explain to me how I can fix it? Sorry for asking again if already answered but im still having trouble with this any help would be greatly appreciated.
ab2, I had this problem twice now. I will paste my previous answer to this question below:
No, the noise you are hearing are from the servo motor that control the vent from inside to outside air. I had two of the motors go bad, one as I mention and the other was for the passenger side temperture control vent. The GM part # 15844096 (made in China) GM sells them for app. $40-$50. These two were fairly easy to replace, I replaced both motors in about an hour. You will need a 1/4" rachet driver and 5.5mm socket. The easiest way I found to get to these two motors, is by removing all items from glovebox and let the gloovebox open down to the floor. You will have to help it pass the stops. You should be able to see both servo motors from the glovebox opening. I would first verify that you are removing the correct servo motor by unpluging the power connector to the servo first and trying it to make sure the noise stops. I hope this helps. By the way the plastic gears on the servo motor break off causing the servo to chatter, causing the knocking noise.
 

·
Registered
Joined
·
954 Posts
Mine just started doing that as well. I just had the drivers side servo replaced with the same exact problem, except it would additionally grind for awhile after I turned the car on.

When I brought it to the dealership, they said the servo was getting stuck in the on position, which actually drained and killed my old battery.

Previously, it was the blend doors, but I think the problem now is whatever actuator switches from windshield to passenger vents.
Was this fixed once under warranty? I would be happy to look into this for you as well with more information including your VIN. Please feel free to contact me privately. Thank you in advance.

Tricia, GM Customer Service.
 

·
Registered
Joined
·
10 Posts
Both times it has been fixed under warranty, fortunately. Each servo motor went bad (first the driver's side, then the passenger's side)
 

·
Registered
Joined
·
85 Posts
Dorman has it

I have the P/S problem now.Found several Dorman with same number that should fit on Ebay.The part # is 604-108.
 
A

·
Guest
Joined
·
0 Posts
clacking noise under dash 2006 impala

I removed one actuator and dis-connected the connector to the other actuator and I still get a loud clacking noise. How is this possible ?? Is there something else other than the fresh air and re circulating actuators that is responsible ?? Do the temp controls (dual zone) have
solenoids or something to make a clacking noise ??
 

·
Registered
Joined
·
5 Posts
had the same problem with 2 of the actuators now having that problem with the third. 07 ls 3500 engine. problem is i don't know where the one for temp control is.
 

·
Registered
Joined
·
1 Posts
Chattering from inside the dash area with no key and car sitting with no doors open, no engine running. Is there a relay that is receiving power from battery and trying to function? Sure sounds like it. Replace inside and outside air circulators already due to cheaply built plastic gear teeth. I have owened several Camaros and other Chevrolets and they ALL lack quality control and are usually electrical nightmares with improper routed wiring.
 

·
Mr. Handy
Joined
·
6,289 Posts
Agreed chevy still to this day has major quality control and electrical problems.

They majorly screwed up with the 8th gen impala's. We see this blend door problem all the time on here and the problem always comes back. Not to mention the tpms/keyless receiver or throttle body (reduced power/trac control) problem.

I will never own another impala newer than 05
 

·
Super Moderator
Joined
·
12,438 Posts
Honestly, the actuator issues with the 8th gens are actually pretty minor issues. The issue is well known and can be fixed by yourself for relatively little cost. Really not that big of a deal.

ALL cars have their own set of issues. I'd rather have to deal with something simple like HVAC actuators than some major engine issues. In fact, I seem to remember that you constantly mention major engine-related gasket issues with the 7th gens, so in comparison, I'll gladly take the 8th gen HVAC actuator issues any day!

My point is that no matter what car you own, there are going to be "known" issues with it. The nice part about the 8th gen issues is that parts are very common and relatively cheap. The procedures to fix the issues are also well known.

Some of the most expensive cars available are also some of the least reliable cars - so even high cost is not a guarantee of a problem-free car.

On the other hand, the reliability issues with the 4-speed transmission in the 2006-2011 Impala *is* a valid concern! :)


Sent from AutoGuide.com Free App
 

·
Mr. Handy
Joined
·
6,289 Posts
The 7th gen gasket issue isn't really major.

I'd much rather replace gaskets than have unknown electrical problems.

The hvac is def not the only electrical problems with the 8th gen.

To each his own though. I was just stating my opinion as I know I am not alone and there are plenty of frustrated 8th gen owners.
 

·
Registered
Joined
·
1 Posts
Old thread but seemed to be the best one for my current issue. I have an 08 LT Impala and replaced the motor for the Vent blend door last summer. When that one went bad it was a slow thumping noise as it tried to close and the baffle skipped.

Now I'm getting a different noise, it's a little quieter and much more rapid noise, more of a clicking than a thumping. It seems to happen most while driving and turning the AC to off.

It is a dual climate zone car. Most of what I've seen online has been for the blend door. Where are the driver/passenger temp servos located? and are they the same motor that the vent blend door used?

Thanks for any help.
 

·
Registered
Joined
·
4 Posts
I had this issue before and just paid the $400-500 years ago, but now I am unsure if I will pay this again. I would love to do it myself but unsure how and I can't continue to shell out cash for these issues.
 

·
Super Moderator
Joined
·
12,438 Posts
There are some great how-to videos and write-ups on this forum on exactly how to replace these actuators. It's a little bit of a PIA due to cramped working space, but there really isn't anything "hard" about it. Just requires a little research and some patience. I truly believe that just about anyone can replace these things. Of course, there are also some great members on this forum that would be willing to help if you have any questions along the way.

Sent from AutoGuide.com Free App
 

·
Registered
Joined
·
1 Posts
yeah i got same problem on my 08 impala this makes second time i got 109,000 miles first time it was on extented warranty i been a chevy man for about 15 years thinking about toyota on next car this impala has a rear tire issue also wears on the inside so we have to have tires dismounted and turned around just to get a longer tire life if we dont will get about 20,000 miles on rear tires
 
21 - 39 of 39 Posts
Top