1999 Cadillac DeVille Logo
Posted on Nov 15, 2009
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High pitch noise under the hood

1999 Cadillac deville high pitch noise coming from under the hood

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Joseph Howard

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  • Master 753 Answers
  • Posted on Nov 16, 2009
Joseph Howard
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Joined: Aug 08, 2009
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Sounds like your serpentine belt is slipping try checking your belt tension with engine off if ok replace belt or purchse belt dressing spray at your local parts house.

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No 12v atfusebox under hood

Look under the bottom of the back seat, behind the carpet coming up from the floor.
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sounds like a bad vacuum diaphram, used to switch coolant flow and/or airflow direction. this is best repaired by an expert, but can be done at home,with the proper tools and a manual specific to your vehicle.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/michael_00678fd4800d19c5

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