Liberty Rattling Noise when AC on - JeepForum.com

 
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post #1 of 13 Old 08-10-2013, 01:13 PM Thread Starter
sebastien7
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Liberty Rattling Noise when AC on

I have a 2003 Jeep Liberty Sport. When I turn on the AC there is a loud rattling sound coming from near the tension pulley/compressor area as best I can tell. I've the whole tension pulley assembly and put a new belt on it about a month ago so I don't think it could be that. It goes away when I turn the AC off or accelerate. I read somewhere it might be the ac compressor clutch but want to make sure before I start replacing items - any ideas?

Thanks.

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post #2 of 13 Old 08-10-2013, 02:25 PM
PeteH
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What did you do to the pulley assembly. Your post is missing a word or two. It was the tensioner assembly, not the pulley bearings on our 03. I bought the entire assembly with both pulleys from NAPA for @ 50 or 60 bucks. Only made noise when the A/C compressor first came on in the morning or after a cool down.
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post #3 of 13 Old 08-10-2013, 02:46 PM Thread Starter
sebastien7
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sorry I meant I replaced the whole assembly
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post #4 of 13 Old 08-10-2013, 03:19 PM
PeteH
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Buy a cheap mechanic's stethoscope and pinpoint the noise. Hopefully cheap and easy.
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post #5 of 13 Old 08-10-2013, 06:27 PM
John317
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Bad Tensioner, some manufacturers products are known not to last to long.
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post #6 of 13 Old 08-10-2013, 06:28 PM
tjkj2002
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Quote:
Originally Posted by John317 View Post
Bad Tensioner, some manufacturers products are known not to last to long.
Yep it's bad tensioner.

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
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post #7 of 13 Old 08-11-2013, 12:58 PM Thread Starter
sebastien7
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Everyone thinks its a defective tensioner? I changed the whole assembly about a month ago. I guess I could swap it out for a new one again and see if that works. If it doesn't I guess I can just return it.
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post #8 of 13 Old 08-11-2013, 12:59 PM Thread Starter
sebastien7
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Again, it doesn't make any noise until the AC is on.
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post #9 of 13 Old 08-12-2013, 04:35 AM
PeteH
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Bad tensioner makes a snapping/ rattling noise. Like a loud clicking/knocking that is not consistent. It really does not increase in frequency when you up the rpm's a tiny bit. It does go away when you accelerate.You will see the timing belt/tensioner jump around a little.
The A/C compressor makes a steady rattling noise that increases in frequency when you increase rpm slightly. It may or may not go away with acceleration.

The tensioner is cheaper than the compressor.
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post #10 of 13 Old 08-12-2013, 06:05 AM
streetglideok
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Quote:
Originally Posted by sebastien7 View Post
Everyone thinks its a defective tensioner? I changed the whole assembly about a month ago. I guess I could swap it out for a new one again and see if that works. If it doesn't I guess I can just return it.
Just because you replaced something a month ago, does not mean it's of decent quality, or could be defective. A lot of times the tensioner will rattle, and you'll see the pulley jumping, when you put a heavy load on the belt system, like the compressor. Also verify you have no wobbling pulleys too. Seen too many people try to pry off their power steering pulleys over the years. I once bought an advance auto parts tensioner for a car I used to have, it was all I could get and I was in a real bind. Rattled from the time I put the thing on, till it spilled its guts.
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post #11 of 13 Old 08-13-2013, 10:00 AM Thread Starter
sebastien7
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Thanks everyone for the insight - greatly appreciate it. I will replace the tensioner again and hopefully it works. The last one I bought was off a vendor on ebay. Does anyone recommend a vendor or brand of higher quality?
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post #12 of 13 Old 08-13-2013, 10:33 AM
John317
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I would suggest you google it and draw your own conclusions. Not being a smarty but dont have long term results to post a reliable result. There are however numerous posts on this. That being said I went with a Gates from NAPA. The autozone Dayco did not have a good review. And they were only $4 dif in price.
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post #13 of 13 Old 08-13-2013, 12:09 PM
tjkj2002
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Quote:
Originally Posted by sebastien7 View Post
Thanks everyone for the insight - greatly appreciate it. I will replace the tensioner again and hopefully it works. The last one I bought was off a vendor on ebay. Does anyone recommend a vendor or brand of higher quality?
No wonder why it failed so soon.


Goodyear tensioner and Gates tensioners are good,nothing really wrong with a dayco tensioner as it's 100 times better then the OEM one and those no named versions.

'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
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