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My 2015 2.0T is making the same squeaking noise as in the OP of this thread: https://www.cadillacforums.com/foru...rum/1018585-engine-squeaking-when-idling.html

The user said it ended up being a loose heat shield but didn't say which one. Prior to reading that thread, when I sprayed belt dressing on my belt, the noise temporarily went away. I was going to replace the belt and tensioner, but the post linked above makes me second guess myself.

A couple questions:
1. Has a loose heat shield been known to make that noise? If so, which heat shield?
2. Does the ATS have an idler pulley, or just the tensioner? I haven't been able to locate an idler pulley part number.
 
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