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Old 08-28-2012, 07:36 PM   #1
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Replaced belt, now squealing when a/c on

Hello All,
I replaced the serpentine belt on my 4cyl, 5spd, 2000 model. Thought I did it correctly thanks to the great advice from the forums. I made sure I had 1/2 inch play up and down just like the old one did. We had the top off at the beach, so no need for a/c and never heard a squeal. We put the top on yesterday, I drove it today, turned on the a/c and heard the squeal. Turned it off and then it quit and I drove it back home. What did I do wrong? Is it too tight or too loose? Or is it a coincidence that the a/c clutch might be going out? I won't drive it till I make some adjustments and need to be pointed in the right direction. Thanks.

PS With the old belt and the a/c on, there was no squeal. I replaced it because I could see cracks starting to form on the inside grooves.

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Old 08-28-2012, 07:42 PM   #2
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I made sure I had 1/2 inch play up and down just like the old one did.
That's a total stab in the dark. Round up a belt tension gauge and do it right. You will likely be shocked at how tight a properly tensioned belt actually is.

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Old 08-28-2012, 07:49 PM   #3
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Sounds like a wrong sized belt. Double check to make sure the clerk gave you the right belt.
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Old 08-28-2012, 08:23 PM   #4
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I will go by the auto parts that sold me the belt and see if I can rent/borrow/buy a belt tension gauge.
They did sell me the wrong size the first time and there was no way it was going on. Found out the clerk made a mistake. It is a Gates belt and the second clerk verified the same number was on the Napa belt that came off. But, I will triple check. Thanks, guys
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Old 08-28-2012, 08:42 PM   #5
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If it's the right belt put some white lithium grease on the back side of the belt and idler pulleys. Don't get it on the side with the groves on it. My '06 4.0 doesn't have any adjustable tensioners other than the spring tensioner that you have to wrench to change the belt. That fixed my squealing belt.
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Old 08-28-2012, 10:39 PM   #6
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Had the exact same issue with my last jeep except I didn't put it n myself. Mine would squeal after the new belt if the AC fan was on anything but low. Once it got warmed up I could turn the fan up with no problem. Another mechanic said that cheap belts would do that. I sold the jeep and never did fix it.
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Old 08-28-2012, 11:08 PM   #7
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Is the tension mark on the tensioner lined up between the other two marks? If all else fails get a better belt, i've had good luck with gatorbacks for squeals. I just put a chinazone belt on my 4.0 and it's been good so far...it was one of their better belts though.
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Old 08-28-2012, 11:19 PM   #8
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Squealing means the belt is slipping. I vote to increase belt tension. At least thats what I would do. Or at a minimum check belt tension again, its likely that the new belt stretched a bit and is now not as tight as you originally thought.
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Old 08-29-2012, 12:25 AM   #9
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Thanks for all the advice. I did fail to check the belt tension after running the engine for a while. I guess I did freak whenever I turned on the a/c. Will check it and hopefully that is it.
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Old 08-29-2012, 12:33 AM   #10
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Originally Posted by SeVeReDiStOrTiOn View Post
Is the tension mark on the tensioner lined up between the other two marks?
2.5L engine. No automatic tensioner.

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