I think mine is going bad on the 04, with 117K..as far as I know its probably factory. Its got a nice belt squeak that I think is coming from that general area. Is there a way to tell for sure its that? There also sounds like the power steering pulley is squeaking too..

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2004- Jeep Liberty
2016- Jeep Wrangler unlimited
1981- Jeep CJ-5
1977- Jeep CJ-5

I'm not sure if there's a definite way to tell if the serpentine belt tensioner is bad, but I've done some light reading on it before, and if I remember correctly, it's a very mild, rather cheap repair/part.

What condition is the belt in?

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2008 Black Jeep Liberty Sport
4.7L throttle body
Old Man Emu lift
Sky Slider
Hypertech Max Energy
K&N CAI
Gibson stainless steel exhaust
Blacked out
ScanGauge2
BFG All Terrrain 225/75/16
JBA upper control arms

Slip the serp belt off and then actuate the tensioner with a long socket wrench or breaker bar throughout its range. The movement should be smooth. If it won't move through that range when unloaded, it might not be working well while under tension either. While the belt is off, check for play and free rotation on all the pullies. Binding in one can exhibit in jumping of the tensioner slipping, etc.

x2 on "what's the condition/age of the belt".

Dan

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2005 Silver CRD Limited
245/75R16 GoodYear Duratracs
Fumoto drain | ProVent CCV Filter
Stanadyne FM100 filter | Cummins fuel pump
GDE Eco | SEGR | BoulderBars | FrankenLift | Frankenskids

If its factory and that many miles its due for a complete unit
Make sure to replace the belt along with the new tensioner
I replace mine on a regular basis just because they do wear and get weaker
and then saving the old one for a back up

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MUDD'S MOTORSPORT'S We do IFS lift installs ,
03 OVERLAND EDITION /Kilby-Skidrow-Mopar-4XGuard skids/ 2.5 inch TOTAL CONTROL JBA coilovers -JBA Arms/MOABS-31 FALKEN WILDPEAK AT3W / 4.10's etc, 04 Kilimanjaro Edition loaded, plus 05 KJ limited

Yeah from what I have read I think I'm just gonna replace it, Is it just that one bolt in the center between the two pulleys and it comes off?

The belt is pretty new, I replaced it awhile ago when I did the water pump..

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2004- Jeep Liberty
2016- Jeep Wrangler unlimited
1981- Jeep CJ-5
1977- Jeep CJ-5

I'm gonna be replacing the whole tensioner unit, but I think I have others making noise. Would the P/S pulley go bad? Or alternator pulley? What about the A/C compressor?

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2004- Jeep Liberty
2016- Jeep Wrangler unlimited
1981- Jeep CJ-5
1977- Jeep CJ-5