AC Squeal The AC makes a a noise that sounds like a loose belt. However I have already tightened the tension adjustment completely and replaced the belt. At higher RPM the squealing stops. My question(s) are: Is this indicative of a failing clutch? If it is most likely belt slippage, could I replace belt with slightly shorter belt or do I need to replace the tension adjustment device (the tension adjustment appears to be working properly)? The AC works fine its just whenever the compressor engages at lower RPM i.e. idling, there is a slight squealing sound. The squealing is typically louder when AC is first engaged and then it will reduce considerably but will not completely go away unless the engine RPMS are about 1400. During highway driving conditions, I never hear the squealing only in stopped traffic.

Sorry. I put the make and model in the orignal question but for some reason it did not appear. it is a 1996 Isuzu Trooper LS Sorry. I put the make and model in the orignal question but for some reason it did not appear. it is a 1996 Isuzu Trooper LS

The belt appears to be running true not misaligned. What i was unsure of was if a failing clutch would stop squealing when the engine is revved. The belt seems to be pretty tight i.e comparable to the other two belts. The belt appears to be running true not misaligned. What i was unsure of was if a failing clutch would stop squealing when the engine is revved. The belt seems to be pretty tight i.e comparable to the other two belts.

Also, I did not start having this problem until the AC and clutch were replaced. Took it back and they said that it was the belt and that there was no more adjustment. I verified that the adjustment nut is fully engaged. I though I might try a shorter belt but wanted to rule out the clutch first since it is supposed to be new. Also, I did not start having this problem until the AC and clutch were replaced. Took it back and they said that it was the belt and that there was no more adjustment. I verified that the adjustment nut is fully engaged. I though I might try a shorter belt but wanted to rule out the clutch first since it is supposed to be new.

Also verified that the installed belt is the correct belt. It just seems like there is not very much adjustment. Theres alot more scew left when loosening to install the belt. From not fully engaged as tight as it will allow me to adjust, I only have to loosen about 15 revolutions or so to remove the belt. When i feel underneath the tensioer, there is still about two inches of screw left for further loosening if required. Also verified that the installed belt is the correct belt. It just seems like there is not very much adjustment. Theres alot more scew left when loosening to install the belt. From not fully engaged as tight as it will allow me to adjust, I only have to loosen about 15 revolutions or so to remove the belt. When i feel underneath the tensioer, there is still about two inches of screw left for further loosening if required.