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Discussion Starter #1
I have a 2007 Compass with 80K miles. From my research, it seems the alternators go out around this mileage.

I am getting a rattling noise on idle and a high-pitched whir during deceleration. Everything I've read about how these stupid ill-designed alternators work points towards it (more specifically its pulley) being the issue.

I'm just looking for some confirmation from anyone who is familiar with what a failing alternator clutch sounds like. If need be, I can record the sound and post it. I am stationed overseas so it's difficult for me to get parts (and get them quickly) for my vehicle despite how much I really want to throw parts at it right now.:mad:
 

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You'd want to isolate it to the Alternator or whatever is causing it. Guessing does not cut it. Especially being a big job replacing it.
 

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Discussion Starter #3
I was under the hood today and replaced the two idler pulleys and the tensioner pulley. The rattling sound is still there. It's very noticeable during idle. any ideas?
 

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ur first post describes the exact symptoms of a bad ADP pully (attached to alternator)

my wifes car sounded the same way. i bought a reman Alternator from a local store and replaced it myself. cost about 125$.

u can get the tools to just replace the ADP but they are expensive and its not that easy.

use a short length of pipe and put ur ear on one end of it, put the other end in the engine bay, carefully, and move it around near the alternator, u should hear the grinding getting louder as u get closer to the alternator pulley, if so its bad.

heres two quick vids i made which might help if ur gona do this job urself, good luck;)

Removing an Alternator on a Jeep Compass, Part 2 - YouTube

Jeep Compass Alternator Replacement - YouTube
 

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Discussion Starter #5
Thanks Guinness for the reply. While I was replacing those pulleys about a month ago, I looked at the ADP pulley while I had the Jeep on the lift... that thing is impossible to change without taking the alternator out first. Why not just replace the whole thing... especially if you can get them that cheap. I've still been driving around with the Jeep... even taken it on some long trips. I must say I'm surprised that even with this issue, it's been holding up. It just sounds like a jet sometimes with that high-pitched whir... lol
 

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You pretty well have to replace the alternator. ADP section is expensive piece and if the bearing is going in the alternator. Doing the job twice will definitely be on the "I can't believe it" list. An alternator shop sure can change it but what would they sell if for. A rebuilt comes with it as well as new bearings etc.
 

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yea replacing the whole thing is def the way to go.
they will last a pretty good while as they are going bad but eventually u will have to deal with it, good luck!
 
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