i know what you are talking about. i thought it was just the fan spooling up. i've also heard it on other blazers driving by in parking lots.

 

Yea, I've heard it for a while, but when I try to pinpoint what it could be, I can't. That's why it bugs me. It goes in the shop next monday, so we'll see. Hopefully when I do take it in, it's doing it that time. Lately, it has been cutting off every now and then.