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Unread 07-24-2011, 03:12 PM   #1
steve L.
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1997 ZJ 
 
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Belt squeels when AC is on

So it seems that whenever I turn on my AC the belt starts to squeak really bad. I assume I need to tension the belt? If so, how do I do that exactly?

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Unread 07-24-2011, 08:29 PM   #2
classicmetalman
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Sure it's your belt and not one of your pullies?
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Unread 07-24-2011, 09:12 PM   #3
TheHalfWit
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I'd check the deflection of the belt, and how loose it feels. The adjustment method is different from my 95 but I dug up a pic on adjusting the manual 96-98 I6

http://www.jeepforum.com/forum/f13/z...2/#post8759648

(hope thats the right diagram, the 93-95's are a lot more fun to do. )
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Unread 07-25-2011, 01:24 AM   #4
dougreuter
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I just had to replace mine because it did that, even if the belt is stripped just a little bit it will make that sound
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Unread 07-25-2011, 01:46 AM   #5
Candymancan
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Mine did the same thing, when it started getting warm outside i turned the A/C on and then the belt started to squeel. Then went away but then a week later it just got so bad the noise was unbearable. Replaced the belt with a new one and it works like a dream now. Been working fine for a few months now. Make sure you clean and inspect the pully's for bad bearings and wobble.
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Unread 07-25-2011, 03:02 AM   #6
Bale
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My serpentine belt sometimes squeals for a few seconds after startup. Can't see why it squeals some times, and most times not

A question: The belt has lots of tiny transverse cracks on the outside. Time for replacement, or is this normal?

Thanks in advance.
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Unread 07-25-2011, 07:27 AM   #7
Boodyrider
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Time for replacement.
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Unread 07-25-2011, 08:29 PM   #8
steve L.
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I don't think it's the belt. It's not in bad shape. It only does it when I first turn on the AC. Then once the engine warms up it goes away.
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Unread 07-25-2011, 08:49 PM   #9
Candymancan
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My old belt looked ok too, but like i said after i replaced it is was fine. Its only $30
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Unread 07-25-2011, 09:14 PM   #10
CrazyMacaw
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If you're sure the belt is ok and tensioned correctly then it could be the compressor showing signs of wear or maybe it's pulley is glazed.
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Unread 07-25-2011, 09:22 PM   #11
steve L.
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how do I know if it is tensioned correctly?
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A Little Taste of Jersey Wheelin Of A 1997 & 1998 Jeep Grand Cherokee's For Your Enjoyment.

http://www.youtube.com/watch?v=sxa3-LJhz-Y
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Unread 07-26-2011, 01:09 AM   #12
CrazyMacaw
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Quote:
Originally Posted by steve L. View Post
how do I know if it is tensioned correctly?
Well, if you're really good you just grab the belt with one hand, stick your tongue out the left side of your mouth and with the other hand scratch your privates and proclaim "feels pretty good to me"

Me personally, I prefer to measure the belt tension between the idler pulley and the p/s pulley with a belt tension gauge. Not enough tension and the belt slips, too much tension and you could cause damage to the bearings of the engine's externals.
A new belt should have between 180lbs - 200lbs of tension.
A used belt should have between 140lbs - 160lbs of tension.

Gates makes an inexpensive tool called a Krikit II for checking Ribbed V /serpentine belts they're about $20.
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Unread 07-26-2011, 06:33 AM   #13
melk
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Just installed a new Gates belt on my 4.0 and it made a world of difference. Engine runs tight and strong, not loose and sloppy like it used to. Paid $44 local.
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