Serpentine belt- when to replace? - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain

02-09 Vortec 4.2L I-6 Engine and Drivetrain Q&A forum for engine and drivetrain repairs/modifications/tuning.

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  #1  
Old 11-13-2006, 12:10 PM
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rbarrios rbarrios is offline
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Serpentine belt- when to replace?

I remember the belts go for a long time....
My belt was replaced at about 46,800 when my water pump failed(bearings) and the fan wobbled like crazy. this causedthe edges of the belt to get worn out- so it was replaced.
Im now at 91,400 - and wondering if this belt with 45,000 miles is ready to be replaced.
I looked at it. Looks a little brown along the grooves.- but dont know if thats normal- cant really see any cracks.
what are you all doing?
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  #2  
Old 11-13-2006, 12:17 PM
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I just replaced the one on my wife's 02' and it has 91K on it. It was beginning to crack on the grooved side and was stretched a little as well as starting to glaze. I really don't think any less than 90k for a replacement on this is required and IMO it could have gone easily another 10-20K on the original.
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  #3  
Old 11-13-2006, 02:42 PM
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There's nothing like peace of mind. Replace it and keep the old one in the truck as a spare.
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  #4  
Old 11-13-2006, 03:04 PM
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did a search- but how do your replace it.
Seems its releasing tension on tensioner---- but how do you do that?
anyone have pics?
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  #5  
Old 11-13-2006, 03:13 PM
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You should be able to release the tension by using a socket ratchet set up on the tensionometer. I haven't done it on the TB/EN though. GM says to change them at 150k which is a little too long for me so I change mine at 75k. At 150k I would also change the water pump and tensionometer if they were not changed already.
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  #6  
Old 11-13-2006, 05:11 PM
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hmmmm. so at 45,000. the belt is still young...
though harder to see small defects on the grooved side as compared to the old V-belts.
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  #7  
Old 11-13-2006, 05:20 PM
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GM says they're good for over 100k, and when I worked at the dealer, numerous people in the repair shop told me that was an understatement.
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  #8  
Old 11-13-2006, 06:06 PM
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I've never actually seen a serpentine belt break! Every 'failure' I've seen on serp belt equipped vehicles was caused by a bad idler pulley bearing, tensioner, waterpump, etc... never the belt itself! They last a very long time. Dealers love to recommend a replacement as it's a super easy money maker for them.

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  #9  
Old 11-13-2006, 06:39 PM
NotForBling NotForBling is offline
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I was under the impression it was at 100K as well as a rule of thumb. Although mine is now at 100K+ it still looks good,hhmmm....wonder if the lady who owned it before me replaced it or if it was replaced before I bought it used at the dealer.

But from what I have always heard....100K.
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  #10  
Old 11-13-2006, 08:28 PM
TB_Style TB_Style is offline
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If it was me I would wait for the belt to almost fall apart.

If my family was in it I would replace the belt when I first saw signs of wear which is cracking across the ridges, then put it in the back as a spare as recommeded prior.
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