Farting or groaning noise from climate control system

[ascariSTS]

Hello0o0o,


The forum is really dead... few threads, few posts... That means one thing... STS has very few problems


anyways, that farting noise coming from the AC (when you switch air circulation)... It's drivin me nutzZzzzZzZzz.....


Any solution to that?... is there any TSB ?

[Cajonkev]

There isn't a TSB or advisory that I'm aware of yet but when asked my Service Manager new immedietely of the issue and had a fix action for it. Although I have the issue I didn't have it done (for other reasons) but he has been straight up with me on everything else to date.

[Jesda]

What did the repair involve?

[Cajonkev]

We were dealing with a seperate issue that I didn't want to get off track of so I didn't dig any further at the time. I'll post it when I talk to him next.

[Zorb750]

Is it vacuum related?

[ascariSTS]

[05STSWOW]

I had the same problem months ago and was able to replicate the noise for the service advisor. I called it the seat farts. It is apparently an hvac valve servo (electric or vacuum, I don't know). I think it was a lubrication issue. Capital Cadillac Atlanta fixed it under warranty. No further problems, but it was good for a few laughs for a while...

[GA1019]

mine does it too......i agree it is some sort of a/c mixing door operation

[ewill3rd]

I have fixed two of them, it's a clearance issue but heavy lubrication will fix it.

If you turn on the A/C and then press the recirculate button it will do it, press it again and wait a few seconds then press it once more. You'll hear the noise. The cam that drives the recirculation door is tight and it causes a noise on the actuator arm.
You have to remove the glove box to reach the actuator. The first one I did I removed the whole blower assembly to locate the noise, the next one I just lubricated. It's easy once you get the glove box out. If I do another I'll take a picture.
You just have to lubricate the pin off the actuator where it goes into the cam and the noise will stop after a few cycles.

[Joe Gros]

Back in March I started a thread called "Passing Gas" which sounds like the same sound described in this thread. I finally diagnosed the problem for the dealer and he changed the recirculating actuator, under warranty, and it seems like the problem is fixed.

[Cajonkev]

My servicing dealer also takes the "lubrication" route and has done several already.

I had them do mine 4-5 months ago and it was still fine when I turned it back a couple of weeks ago.

[ascariSTS]

Originally Posted by ewill3rd

I have fixed two of them, it's a clearance issue but heavy lubrication will fix it.

If you turn on the A/C and then press the recirculate button it will do it, press it again and wait a few seconds then press it once more. You'll hear the noise. The cam that drives the recirculation door is tight and it causes a noise on the actuator arm.
You have to remove the glove box to reach the actuator. The first one I did I removed the whole blower assembly to locate the noise, the next one I just lubricated. It's easy once you get the glove box out. If I do another I'll take a picture.
You just have to lubricate the pin off the actuator where it goes into the cam and the noise will stop after a few cycles.

Thanks a lot for the help...

I'll drop my car at the dealer's this saturday.. i'll tell you about it...

[ascariSTS]

ewill3rd and Cajonkev


Thanks a lot for the help... I took my car to the dealer and told them whatever you told me... It works... .the noise disappeared

[Cajonkev]

Glad it worked, and I hope it lasts!!!!

[justgreat]

this board is quite lucky to have a caddy tech on the watch, so to speak...thanks, ewill3rd. it's good to have "an inside view" of our caddys.

jackg
06 sts6 on order