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Old 07-09-2023, 09:16 PM   #2
Ultramaroon
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Join Date: Sep 2014
Drives: a 13 e8h frs
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First sign will be squeaking right after cold start. The belt likes to collect sand and sand-sized particles. The pulleys squeeze them into the grooves. When enough collect in an area, they allow the belt to slip over the alternator pulley when it's working the hardest to recharge the battery.

Unless you don't mind spending a couple hours picking them out, just replace it. I find it rewarding to refresh an otherwise perfectly good belt. Link to service manuals are in my sig.
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