I was thinking this might be the case. I need to get in there to put in a new vacuum pump anyway, so I may as well just wait until I'm ready to tear into the whole accessory drive.

What's the best way to check the tensioner/damper, or should I just assume it's getting to the end of its lifespan at 145k miles and replace it?

Thanks!

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Garage:

2017 Chevy Colorado Diesel (nanny state emissions)
2005 Volvo S40 T5 AWD, 77k
1987 Mercedes-Benz 300D turbodiesel, 4 sp auto, 156k - 28.7 mpg
1996 Tracker 4x4, 2 door, 16v, 3 sp auto. 113k - 28.6 mpg

WARNING: this post may contain dangerous free thinking.