Something that happened to me a few years ago on my heep. My h2o pump bearings were going, causing a rattle. I was on the road at the time and just had the ability to tighten the belt - did that, sound went away, but 2 days later the bearings went. Tightening the belt made the sound go away, but not the problem. Maybe it's not the belt getting changed, but the belt being tightened down more by the dealer?
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