Whirring Noise When A/c Is On

[wtotten]

In my 98 ES300 I recently noticed it making a high-pitch whirring (whistling) noise when the car is cold and the A/C is on. Once the car warms up, the noise goes away. If I turn the A/C off when the car is still cool, the noise stops. Any ideas what might be causing this? The alternator was just recently replaced (if that matters).

Thanks in advance,

Bill

[SKperformance]

i am going to say that the belt for the alt and the a/c is tooo tight and only loosens when the belt expands with heat

if it stays this way it will overload the bearings and cause them to fail

take it back and get it adjusted

[steviej]

I concour with sk.

sj