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      07-09-2018, 11:49 PM   #1
gpraceman
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A/C Belt Tensioner

My '06 Z4MR A/C belt is needing to be replaced. Is it recommended to also replace the belt tensioner when doing so? She's a hair away from 60K miles. The drive belt looks fine, so I assume it was replaced at some point.
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      07-10-2018, 12:14 AM   #2
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I replaced mine proactively when one of my idlers got wobbly and I replaced everything, but in retrospect, I think it was overkill.
And that was at about 100k miles.
If it's not wobbly, I wouldn't bother.
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      07-10-2018, 12:26 AM   #3
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Quote:
Originally Posted by StickMon View Post
I replaced mine proactively when one of my idlers got wobbly and I replaced everything, but in retrospect, I think it was overkill.
And that was at about 100k miles.
If it's not wobbly, I wouldn't bother.
That's what I was thinking. My local dealer wants to replace the tensioner and the belt ($527 quote). I do take what any dealership says with cynical skepticism. Anyways, this seems like an easy enough DIY project, from the YouTube videos I have seen. I've got enough expenses with trying to do Inspection II here soon, so the more I can DIY, the better.
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      07-10-2018, 12:34 PM   #4
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Replacing the AC belt is about a 15 minute job, and 10 minutes of that is removing and replacing the diaper.
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      07-10-2018, 03:35 PM   #5
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Replacing the AC belt is about a 15 minute job, and 10 minutes of that is removing and replacing the diaper.
Thanks. I think I'll wait until I get the belt off to see if there is an issue with the tensioner and go from there.

On a different subject, it looks like your bumper has made it to El Paso, TX. A bit of a strange route to LA. Should have made a right turn at Albuquerque, as Bugs Bunny would say.
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      07-10-2018, 03:57 PM   #6
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Yep, I was thinking the same. This isn't Pismo Beach!
Hopefully it's not going to continue into Mexico.
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      07-10-2018, 07:01 PM   #7
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Yep, I was thinking the same. This isn't Pismo Beach!
Hopefully it's not going to continue into Mexico.
I got an email update that it got to Phoenix. So, it's most of the way there.
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      07-14-2018, 06:54 PM   #8
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Quote:
Originally Posted by StickMon View Post
I replaced mine proactively when one of my idlers got wobbly and I replaced everything, but in retrospect, I think it was overkill.
And that was at about 100k miles.
If it's not wobbly, I wouldn't bother.
How do I know when it gets wobbly?
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      07-15-2018, 02:02 AM   #9
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I had the belt off while I was replacing my alternator, and knowing that they're a wear item, I gave each pulley a good hearty wiggle.
Main tensioner pulley had obvious slop in the bearing.
Eventually they'll start to rattle and squeak.
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      07-16-2018, 10:55 AM   #10
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Quote:
Originally Posted by StickMon View Post
I had the belt off while I was replacing my alternator, and knowing that they're a wear item, I gave each pulley a good hearty wiggle.
Main tensioner pulley had obvious slop in the bearing.
Eventually they'll start to rattle and squeak.
Squeaky tensioner is what I had when I bought my car back in 2009. This may have been my first fix. I think the mechanical tensioner was discontinued at that time so I bought a non-OEM replacement from Rocky Mountain European online.
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