What causes a squealing sound when I turn on a Jeep Air conditioner?

Answer by  JOHNEBEG (486)

Road grease on pulleys cause air conditioning belts to slip and squeak. Check belt condition and tension. If no grease and belt condition and tension are good, compressor needs oil.

Answer by  scrtwrldfalxmac (107)

A high pitched squealing sound can be caused by the air compressor stealing away some of the horsepower and causing more resistance in the fan belt. The increased resistance will quite often cause the fan belt to begin to slip and produce a high pitched squeal. Try increasing the tension by using shims or increasing the tensioner.

Answer by  Amber40 (24961)

Well that could either be the ac compressor clutch slipping or a worn bearing squealing. I would replace them or take it to a shop.

Answer by  codykeller (153)

Likely caused from a bad, or about to go bad a/c compressor. The belt begins to work overly hard to turn the compressor and slips and squeals under stress