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-   -   Clicking noise under the dash, is it a Blend Door issue? (http://www.impalaforums.com/chevy-impala-8th-gen-discussion/301854-clicking-noise-under-the-dash-is-it-a-blend-door-issue.html)

CubSmurf 11-14-2011 06:13 AM

Clicking noise under the dash, is it a Blend Door issue?
 
Found this thread: http://www.impalaforums.com/chevy-im...lend-door.html

Same sound, but my issue is just a little different. Instead of happening when you change the temp., it happens when you switch where the airs goes (i.e. from window defrost, to feet, to cabin). It has trouble moving the door so the air switches location...while it clicks the air is stuck blowing on the front window, but once it finally 'connects' and stops clicking the air is directed to the correct spot.

Is it the same part just in a different location?

2006 Impala SS

805_IMPALA_SS 11-14-2011 04:57 PM

i have had 2 AC actuators go bad. Its likely one of those i would think. from my understanding the gearing is super cheap plastic and isnt too reliable. Not too sure if its same exact part but the actuator itself probably about $50. Super irritating problem hope you can get it fixed soon lol when mine had this it drove me crazy

ImpSS07 11-14-2011 07:27 PM

Watch this, it'll show you how to do it yourself. You can find the part on ebay or you can get it from the dealer, the price difference shouldn't be that much.



I made this video so if you have any questions or need help, just ask either on here or on the comments section of the vid.

CubSmurf 11-15-2011 05:37 AM

Quote:

Originally Posted by ImpSS07 (Post 413024)
Watch this, it'll show you how to do it yourself. You can find the part on ebay or you can get it from the dealer, the price difference shouldn't be that much.

06+ Impala AC tick fix vid.wmv - YouTube


I made this video so if you have any questions or need help, just ask either on here or on the comments section of the vid.



So it IS the same part?? My clicking isn't connected the temperature wheel, but the air flow wheel. Or at least it seems that way...

Or does this noise ONLY come from this part?

ImpSS07 11-15-2011 11:10 PM

No the temp has nothing to do with these, they are connected to the flow as you suspected. If you open your glove box all the way where it swings loose and turn your car on and play move the wheel to the defrost setting you'll see the blend door open or close.

As far as I know these are the only thing in the car that make this noise.

CubSmurf 11-16-2011 05:32 AM

Quote:

Originally Posted by ImpSS07 (Post 413411)
No the temp has nothing to do with these, they are connected to the flow as you suspected. If you open your glove box all the way where it swings loose and turn your car on and play move the wheel to the defrost setting you'll see the blend door open or close.

As far as I know these are the only thing in the car that make this noise.


So is there just one of these, which is shown in the video? How long does it take to switch out? I really appreciate the info!:beer::beer::beer:

77Impala 11-16-2011 08:08 PM

I have not change the air flow actuator yet so I am not sure how long it takes. On the passenger blend door it took me less than 10 minutes. I believe the air flow actuator is on the same side behind the glove box and would expect maybe 30 minutes to change.

On these cars I believe that the same actuator is used on the temp blend doors and recirculation air, and a different one is used on the air flow directional actuator.

CubSmurf 11-17-2011 05:38 AM

Quote:

Originally Posted by ImpSS07 (Post 413411)
No the temp has nothing to do with these, they are connected to the flow as you suspected. If you open your glove box all the way where it swings loose and turn your car on and play move the wheel to the defrost setting you'll see the blend door open or close.

As far as I know these are the only thing in the car that make this noise.


So do you go through the glove box to change them out? Sorry for all the questions, I just want to get as much info as possible before I start tearing apart the car;)

plano-doug 11-17-2011 11:22 AM

Quote:

Originally Posted by CubSmurf (Post 412774)
Found this thread: http://www.impalaforums.com/chevy-im...lend-door.html

Same sound, but my issue is just a little different. Instead of happening when you change the temp., it happens when you switch where the airs goes (i.e. from window defrost, to feet, to cabin). It has trouble moving the door so the air switches location...while it clicks the air is stuck blowing on the front window, but once it finally 'connects' and stops clicking the air is directed to the correct spot.

Is it the same part just in a different location?

2006 Impala SS

I think you are seeing two different but related problems. There are four actuators in the split control system (ie, with separate temp controls for driver and passenger). Three of them are the same - one on each side, over the hump, and one behind the glove box on the right. The first two control the driver and passenger side blend doors, respectively. The one behind the glove box controls the recirc mechanism. These are the ones usually making the noise. I've replaced two of them now and somehow managed to repair the third one.

I think, if the video cited herein is the one I saw, it covers all three of these.

The fourth actuator is different. And a mutha to get at, according to the shop manual. Plus, looking at it, it's sort of a Rube Goldberg mechanism, which makes me wonder how it works. And, that may explain why it doesn't always work :)

Anyway, I notice that my vent controls get out of whack whenever one of the other three actuators has started making noise. I'm not sure how one affects the others, but there does appear to be a strong correlation between the two conditions. (I've got a couple theories on this, but it'll cost you a few beers to hear them :)

Resetting it - ie, disconnecting/reconnecting the battery - seems to solve the vent control issue once the other offending actuator has been replaced. Key point here, I doubt this actuator needs replacing. Fixing the noisy one and resetting the system is likely all that's needed.

The part numbers for the (three identical) actuators are GM# 15844096 or ACDelco # 15-73517. But, they've been superceded, and I think the new one is GM# is 22754988, but I can't verify that right now. I paid about 50 bucks for one at the dealer last week, and that's when I was informed of the new part number. Hopefully that means they've modified it to make it a little more reliable.

The reason I don't think it's the fourth actuator is because, when you change the vent settings, these things tend to go thru all sorts of gyrations, moving multiple actuators at the same time. For example, recirc is not allowed on some vent settings, so that actuator will move even though all you changed was the vent setting.

That said, I could be wrong. So, the best way to isolate is to get your hand on it when it's making the noise. You can feel which one is slipping. If it's one of the three identical ones, change it first and see if the problem goes away. Having to change the fourth one looks way involved (as in disassembling the dash). So if you don't have to do that, it will be a huge relief.

Hope this helps.

Doug

.

CubSmurf 11-17-2011 11:39 AM

Quote:

Originally Posted by plano-doug (Post 413680)
I think you are seeing two different but related problems. There are four actuators in the split control system (ie, with separate temp controls for driver and passenger). Three of them are the same - one on each side, over the hump, and one behind the glove box on the right. The first two control the driver and passenger side blend doors, respectively. The one behind the glove box controls the recirc mechanism. These are the ones usually making the noise. I've replaced two of them now and somehow managed to repair the third one.

I think, if the video cited herein is the one I saw, it covers all three of these.

The fourth actuator is different. And a mutha to get at, according to the shop manual. Plus, looking at it, it's sort of a Rube Goldberg mechanism, which makes me wonder how it works. And, that may explain why it doesn't always work :)

Anyway, I notice that my vent controls get out of whack whenever one of the other three actuators has started making noise. I'm not sure how one affects the others, but there does appear to be a strong correlation between the two conditions. (I've got a couple theories on this, but it'll cost you a few beers to hear them :)

Resetting it - ie, disconnecting/reconnecting the battery - seems to solve the vent control issue once the other offending actuator has been replaced. Key point here, I doubt this actuator needs replacing. Fixing the noisy one and resetting the system is likely all that's needed.

The part numbers for the (three identical) actuators are GM# 15844096 or ACDelco # 15-73517. But, they've been superceded, and I think the new one is GM# is 22754988, but I can't verify that right now. I paid about 50 bucks for one at the dealer last week, and that's when I was informed of the new part number. Hopefully that means they've modified it to make it a little more reliable.

The reason I don't think it's the fourth actuator is because, when you change the vent settings, these things tend to go thru all sorts of gyrations, moving multiple actuators at the same time. For example, recirc is not allowed on some vent settings, so that actuator will move even though all you changed was the vent setting.

That said, I could be wrong. So, the best way to isolate is to get your hand on it when it's making the noise. You can feel which one is slipping. If it's one of the three identical ones, change it first and see if the problem goes away. Having to change the fourth one looks way involved (as in disassembling the dash). So if you don't have to do that, it will be a huge relief.

Hope this helps.

Doug

.


Doug, thanks for the info! It is VERY appreciated!

Is it easier to get to the actuator through the glovebox, or just under the dash?

And MUCHO thanks for the part number!!! Ordered it here: GM Parts | GM Accessories | GM Parts House Store
$41 shipped:)

plano-doug 11-17-2011 11:56 AM

Quote:

Originally Posted by CubSmurf (Post 413682)
Doug, thanks for the info! It is VERY appreciated!

Is it easier to get to the actuator through the glovebox, or just under the dash?

It depends. Did you look at the video? (which I can't access right now)

The recirc actuator can only be reached thru the glove box. I ended up disassembling the glove box door to provide more clearance when I replaced the recirc actuator. I think you can get to the passenger side blend door actuator thru there as well. But you can also get to that one coming in from the bottom. And the driver's side blend door requires you come in from the bottom. Neither of these two is really that difficult, but I found myself cussing a lot anyway :) The recirc actuator was the most difficult of the three. Young eyes and small hands help a lot.

Doug...with old eyes and big hands...

.

plano-doug 11-17-2011 12:30 PM

Eating my words....
 
Quote:

Originally Posted by m
Anyway, I notice that my vent controls get out of whack whenever one of the other three actuators has started making noise. (snip)

Resetting it - ie, disconnecting/reconnecting the battery - seems to solve the vent control issue once the other offending actuator has been replaced. Key point here, I doubt this actuator needs replacing. Fixing the noisy one and resetting the system is likely all that's needed.

Well, no sooner than I wrote that, I took the car to McDonald's for a cup of coffee and the vent selection was all screwed up despite the other three actuators working fine (ie, being noise free).

The car has a history of this, but it always seemed to correlate to one of the other actuators being in disrepair. And it comes and goes, eventually correcting itself.

One of my theories was that the incorrect vent selection was due to an electrical issue related to the failing actuator (noise propagating back to the microcontroller from the slipping actuator). The micro sits between the vent controls (ie, knobs) and directs the actuators accordingly. My thinking was that maybe the micro got confused and selected the wrong vents. For example, maybe the software was set up for multiple cars/vent systems and the noise caused a bit to flip somewhere thereby making the micro think it was controlling an 06 LeSabre instead of my 07 SS (hypothetically speaking).

Having only recently seen a pic of the fourth, vent actuator, my theory has shifted a little, with me wondering if it wasn't malfunction of the vent actuator rather than an electrical problem. Seeing the pic, it looks like the malfunction could indeed be mechanical instead of electrical. This thing appears to have some mechanical logic in it, 1890's technology http://www.impalaforums.com/images/icons/icon12.gif

Anyway, for the fourth actuator, if it's not making noise, the worst scenrario is you have air coming out the wrong openings. This is most problematic in winter when only a trickle of air is getting to the glass. Fortunately, that doesn't present much of a problem here in north Texas, although a couple times last winter I was on the verge of taking the hairdryer out to the car http://www.impalaforums.com/images/icons/icon7.gif

Seriously, this vent actuator looks like a booger to replace, so if it occasionally causes a problem you can live with, I'd try to ignore it. And, until I can tear into one, it's still not clear whether the incorrect vent selection is due to the actuator or the micro.

Doug

.

CubSmurf 11-17-2011 12:39 PM

Quote:

Originally Posted by plano-doug (Post 413692)
Well, no sooner than I wrote that, I took the car to McDonald's for a cup of coffee and the vent selection was all screwed up despite the other three actuators working fine (ie, being noise free).

The car has a history of this, but it always seemed to correlate to one of the other actuators being in disrepair. And it comes and goes, eventually correcting itself.

One of my theories was that the incorrect vent selection was due to an electrical issue related to the failing actuator (noise propagating back to the microcontroller from the slipping actuator). The micro sits between the vent controls (ie, knobs) and directs the actuators accordingly. My thinking was that maybe the micro got confused and selected the wrong vents. For example, maybe the software was set up for multiple cars/vent systems and the noise caused a bit to flip somewhere thereby making the micro think it was controlling an 06 LeSabre instead of my 07 SS (hypothetically speaking).

Having only recently seen a pic of the fourth, vent actuator, my theory has shifted a little, with me wondering if it wasn't malfunction of the vent actuator rather than an electrical problem. Seeing the pic, it looks like the malfunction could indeed be mechanical instead of electrical. This thing appears to have some mechanical logic in it, 1890's technology http://www.impalaforums.com/images/icons/icon12.gif

Anyway, for the fourth actuator, if it's not making noise, the worst scenrario is you have air coming out the wrong openings. This is most problematic in winter when only a trickle of air is getting to the glass. Fortunately, that doesn't present much of a problem here in north Texas, although a couple times last winter I was on the verge of taking the hairdryer out to the car http://www.impalaforums.com/images/icons/icon7.gif

Seriously, this vent actuator looks like a booger to replace, so if it occasionally causes a problem you can live with, I'd try to ignore it. And, until I can tear into one, it's still not clear whether the incorrect vent selection is due to the actuator or the micro.

Doug

.

I think this actuator is the one that's giving me problems. Joy:)

plano-doug 11-17-2011 01:07 PM

Quote:

Originally Posted by CubSmurf (Post 413693)
I think this actuator is the one that's giving me problems. Joy:)

Make sure it's not one of the other three making the clicking sound. IMO, that's far more troublesome than getting the air out the wrong vent. That is, if it's one of the others clicking, and you get that fixed first, you might decide you can live with the defroster blowing on your feet http://www.impalaforums.com/images/icons/icon7.gif

Doug

.

CubSmurf 11-17-2011 01:12 PM

Quote:

Originally Posted by plano-doug (Post 413701)
Make sure it's not one of the other three making the clicking sound. IMO, that's far more troublesome than getting the air out the wrong vent. That is, if it's one of the others clicking, and you get that fixed first, you might decide you can live with the defroster blowing on your feet http://www.impalaforums.com/images/icons/icon7.gif

Doug

.



Good point!


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