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High pitch whisling noise from engine compartment

My daughter hears a high pitch whistling noise coming from then engine compartment while driving. The noise is heard when the A/C is on. Is there some sort of vacuum operator or vacuum hoses associated with the A/C system?

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  • bialke22 Jan 03, 2009

    Have u check the a/c lines out to make sure there is no holes? I had the same problem in my old truck and had to put a new line in and the whistle was not there anymore.

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SOURCE: high pitched whine/whistle on startup - 2003 Toyota Sienna

I have the same problem like yours but what i did is to replace the alternator and now its so quite no more high pitched sound. You may used belt stress fluid but its only last for few seconds then sound comes again. I replaced it with refurbish part alternator.My sienna 2005.

Posted on Feb 04, 2009

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