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I searched with no luck. Every minute or 2, my car makes a high pitched "whoo" noise. It sounds as if it's coming from the driver's side engine bay (but that could be because i'm sitting there). It's only when the A/C is on. Doesn't matter how hard the fans are blowing, it makes the same noise whether i'm sitting there in the parking lot or driving while both accelerating and slowing down. I cant consistantly reproduce it. Any clue what it could be? '01 EX Sedan with about 90k miles.

 
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It's your compressor engaging. Very typical flaw that you just have to live with. Mine does it too!

 
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If the noise is the compressor making the noise, it's not a flaw, the compressor cycles to keep the evaporator from freezing up, it's designed that way.

The noise you're hearing can also be the condenser fan kicking on.

 
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This thread's pretty old, but mine car makes this noise too. Sounds like someone peeps their head in your window and lets out a little whistle.. hahha. It sounds like "huh"? but whistled... haha that's the best I can explain.

 
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thats a funnny problem to have..no help here sorry but thats hilarious..sucks for u!

 
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got the same problem....probably gonna mention it when I take it in to get serviced

 
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There is a TSB from Honda its not worth reading. Your car is normal like the other guy says when your car's a/c engages the freon moves through this really small valve in the a/c lines. Well imagin blowing through a really small hole it makes a whistle sound. Sometimes if you dont have enough freon it will do the same. Might want to check it but I wouldnt really worry about it until it stops working GOOD LUCK!!!