I have an 07' Tahoe LT. For the past 6 months it has been making this chirping sound, which the dealership says its normal. I and many others disagree.[]Here's the details on the noise: Upon a cold start (6 or more hours not started) chirping starts. The sound is comming from the a/c compressor area. The dealership has replaced all belts including a/c belt and still the noise[sm=wtf.gif]. I have questioned the pulleys, and they say they are fine. The noise gets even louder when the a/c is turned on and when vehicle is engaged into gear. I also notice the noise when driving 25-30 mph, espically when the vehicle is in a higher gear. It almost sounds as if something is loose (ie: 2 pieces of metaltouching causing this noise) If anyone has any suggestions or comments on how to remedy this, please reply.

Thank you,

Brandon R

 

Welcome Brandon,
Have your dealer reprogram your PCM with a newly released (yesterday 10/01/2007) software calibration.
The cause of the chirp is the A/C compressor pushing liquid (as apposed to gaseous) refrigerant thru the system, the new calibration will adjust the cycling of the compressor to eliminate this noise.

They can reference STB # 07-01-38-010 for further instruction/information.

Dave

 

Dave, does Chevy pay you to help people on this site?
If they don't, they should.

 

Thanks for the info Dave. I have passed that info on to the guys at the dealership. They are going to try that first thing in the am. I will let you know what they say.....

 

I'll be looking forward to hear how it turns out.

I assure you folks that GM wants you happy with your new vehicle purchase, they are expensive but they really are fabulous machines when you think about it.