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Help wanted! Is this high pitch noise I'm hearing from the front of the engine normal at idle and at engine shutdown? Just noticed it with the hood up and hadn't heard it before. (CT5 Blackwing with LT4). Dealer brushed it off saying it was just vacuum from the intake.

Probably a long shot, but figured I'd ask anyway. I bought my collector edition (86‐066) 2022 ct5-v blackwing last year around this time with 40 miles on the odometer. It was at a dealer that I can only assume bought it from another local cadillac dealer and flipped it. I would love to have the...