2000 Ford Crown Victoria High Pitched Whistle Noise Passenger Compartment Seems

2000 FORD CROWN VICTORIA
65,500 MILES
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I have a high pitched whistle noise in the passenger compartment. It seems to be worse when heater or AC is on. This sounds like a possible hard one to diagnosis but I hope you can give me some ideas. Thank you.

Jack
Dec 21, 2012 at 4:14 PM
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HMAC300
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you may have asometing stuck inside one of hte ducts or heater itself. you might try taking blower out and looking or feelingaround in there for a foreign/loose object or one fo the floor ducts. try to see if it whistles all the time or just when in certain areas of flow like floor, defrost etc.
Dec 21, 2012 at 6:58 PM
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HMAC300
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oh check for vacuum lines disconnected as well as leaking vacuum motors
Dec 21, 2012 at 6:59 PM
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JESSE G2
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Its b of sharp edges on the IAC and valves acting like flutes
Sep 12, 2019 at 1:53 PM
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KASEKENNY
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Thanks for posting to the site and adding your input. This post was from over 7 years ago so I doubt they got your info but maybe that will help others that have a similar issue.
Sep 15, 2019 at 6:09 PM
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