Researched this a lot and found that I only get this grinding sound once a day or after car sits for about 5 hours -AND- I turn on the AIR unit after starting.
Car always starts fine. AC/Heat work fine.
If I have AC off and then turn on after I first start the car, I will hear the grinding like sound and then it goes away. Cannot duplicate unless I let car sit for 4-6 hours or overnight.
Is there a separate belt for the AC than the main belt I just had replaced 8 months ago and had tightened recently for grins?
Could this be a pulley issue?
Hopefully not a compressor problem?
All ideas appreciated.
Thank you Patty