I have an automatic 2005 limited soft-top with 22,000 miles. Just today, it developed an annoying intermittent high-pitched noise. The noise is variable in duration, and is not predictable when it will occur. I have found that it will only occur when the air conditioner is on (snow flake button is on). The air conditioner blows cold air and does not make any noise (except this high-pitched noise). The noise is on the inside of the car, not under the hood.
Any help would be greatly appreciated.

 

My wife's AC fan was making a funny sound (inside the car). I turned the volume up to high then back down. The noise went away and never has returned.

 

i have it also every once in awhile. it almost sounds like a leaf stuck in the fan for me but with a high pitched sound. sometimes i will turn it on high and the sound makes a louder noise then goes away. no idea what it is though.