Strange noise on startup

[acainindy]

Hey guys, I hope someone can help me with this? At startup after my 2008 LTZ has sat for a while (after driving it for a while) I get a strange noise, sounds like a machine gun or a large air compressor. It continues for a few seconds up to one minute. I have noticed that if I turn off the A/C button when it starts it goes away. I live where it can get real humid and I notice it happens more on hot days with high humidity. Also, I can drive in the morning, park and then go out 4-5 hours later and I get the noise.

Is it the A/C belt, compressor clutch or something else in the system?

The A/C blows cold, no warning lights or anything else.

Please help!!!!!

 

[zach2011]

The only sound I know of during start-up is the Autoride compressor. Is it from inside the vehicle, or outside?

 

[acainindy]

Sound like it is outside, if I rev the motor or turn off the the A/C it goes away. It does not happen all the time.

 

[RCE1313]

I'm having the same issue. I took my yukon back to dealship under warranty to replace the belts and it still occurs every now and then. Did you ever try anything or get a fix for the problem?

 

[stevek]

Can you get someone else to start the car and sit in it, then tell us where the noise is coming from?

 

[Modded]

I bet its the compressor clutch bearings about to go out.
Mine makes that noise very slightly during normal temperatures, and very loudly when its cold out. I am waiting till it takes a shit so I can tell the dealer "I told you so!" I have told thema bout the noise like 5 times and they can never recreate it.

 

[RCE1313]

It seems like it always happens when my truck it sitting out in the sun and not in my garage. A/C is left on from a previous drive. Go to crank up and it sounds like a belt is slipping but very loud and a little bit of a whistle. Last for about 10 seconds then stops. Brought it to the dealer and they changed the belts (at least they told me they did?!?!) and it still happens every now and then. Very aggrevating to have on such a new vehicle and I was hoping others have heard about this so I could get a fix for it. Other than this little problem truck is great!!!

 

[Zed 71]

Yeah I get it once in a while too. I left it overnight at the dealer 3 times and they could not reproduce...

 

[GM Customer Service]

Hello,

I see there are a few people having this problem and the dealership was unable to fix the problem. Please let me know if you would like me to contact the dealership and look further into this situation.

Geoff Allen
GM Customer Service

 

[RCE1313]

Geoff - Have you ever heard of any customers having this issue or is this the first you have heard of this problem at start up?