With the onset of cold weather (I think it is related), I have picked up a belt squeal with the AC drive belt. Symptoms

Climate control on - Compressor off - squeal
Climate control on - Compresson on - squeal
Climate control off - no squeal

All belts are about a year old as is the idler pulley. Belts are at the proper tension, I would greatly hesitate to make them any tighter.

Anyone run into the same or similar symptoms.

Thanks in advance,

JCD

PS: Turbodiesel, good to have you back