Air conditioner whining noise

[David H. Brotemarkle CPA]

I have a slight whining noise when air conditioner running on 2018 Liberty. Mechanic has replaced compressor three time (no additional cost). I have also replaced alternator and drive belt and pulley and tensioner. Only makes noise when compressor is running. Any ideas? Jeep runs great and air is cold. Thanks.

 

[duderz7]

You might wanna pull the serpentine belt and see how the other pulleys spin. It could be that the extra stress from the compressor is causing a different pulley to show its weakness. Or try the old screwdriver to the eat bit and narrow it down.

 

[ZachA2008]

Mine did a similar thing and it turned out to be the idler tensioner pulley