Cadillac XTS Forum Discussion, XTS Rear Air Suspension in Current Cadillac Vehicle Discussion; Each morning when I start my XTS the air compressor cranks away for about one min. I don't remember it ...
Each morning when I start my XTS the air compressor cranks away for about one min. I don't remember it doing that when I first purchased the car. My thought a leak in the air system. Before I go back to the dealer I thought I'd see if any one else has noticed a similar occurance.
I haven't noticed the compressor but I am getting a high pitched whistle sound from rear when car is slowing after a run.
Dealer has heard it but not sure what it is.
Taking it in tomorrow, so will report back.
Premium AWD 3800 miles.
Has anyone else heard this sound
I hear strange sounds from the rear suspension, but I'm pretty certain that this is "normal." Noises have been heard from that area with my '77 Eldorado to my (traded) 2011 BMW X5. Without the variable suspension, you get quiet when you parked in the garage. And just FYI, Harley tour bikes have air suspension in the rear and unlike the Gold Wings that have a compressor on board, they have to be checked and manually pumped up when needed and the PSI is dependent on the load being carried. The air will fluctuate due to temp, humidity, hours of riding, etc. So there can be a lot of variables that will kick the XTS compressor on and off. Compressor make funny noises.
"........ The system may exhaust (lower vehicle height) for up to 10 minutes after the engine has been turned off. You may hear the air compressor operating when the height is being adjusted; this is normal. If the compressor runs often for longer than one minute within the same trip and the vehicle remains low in the rear, see your dealer for service."
Is this perhaps the noise to which you are referring?