Squeal with AC on

mitchj01 · 08-05-2005, 04:53 AM

Did a search but no luck

When I first turn on the ZJ (95) wiht the AC running I get a squeal that will only go away if I turn off the AC or after the ZJ has been running a while

seams worse when it is hot and it takes a long time to get cool air from the vents.

just replaced my water pump and the belt looks ok (yes it was squealing before)

Is my compressor getting ready to go? bad pulley or can low freon cause a squeal?

oct7brian · 08-05-2005, 06:08 AM

Could be your compressor , AC clutch, Loose belt, or even a bad idler. I would check to make sure your belt is tight first.

Stocker · 08-05-2005, 06:36 AM

I'm guessing you have the 4.0L which I think uses V-belts instead of the 5.2 which has a serp belt. If you can safely get in there with it idling and A/C on, hold a dry bar of soap against the inner part of the belt (the surface that contacts the pulleys). If the squealing goes away or changes, it's the belt - or most likely, it's adjusted too loosely. Keep all body parts (and clothing) out of moving fans, belts, pullies etc......

doyll · 08-05-2005, 07:22 AM

It's probably a glazed belt caused by not being tight. Tightening it now might stop it, or you might get it too tight and burn out pully bearings. Replace the belt and tention it properly and your squeal will probably go away. It's not low freon. My 07 4.0 is not V belt

mitchj01 · 08-05-2005, 08:15 AM

I thought it was the belt also but it only happens when the AC is running. I can reach over and hit the AC button on the dash and it immediatly stops

its the 4.0 95 ZJ with serp belt

**RAAB3485** · 08-05-2005, 10:39 AM

Quote:

Originally Posted by doyll

It's probably a glazed belt caused by not being tight. Tightening it now might stop it, or you might get it too tight and burn out pully bearings.

Or like I did back in the day with my Isuzu Rodeo, overtighten it to the point that while driving down the road the belt exploded under the hood leaving me with no A/C, and belt shrapnel under everywhere under the hood. I kept one part of it, it kinda did the same thing to the belt that happens when a tree gets struck by lightning, it like split down the ribs and blew apart.

Anyway, it might be your compressor, usually when things along the belt are going out, they get hard to turn, and when that part is engaged, it can cause it to slip even with good tension on the belt.