Sounds like a tractor wtf???
i drove my truck the other day for the 1st time in a little while, and first off i used the a/c, i rarely ever use it but it was hot as fawk and humid so i said what the hell. anyways when my trucks idleing the a/c compressor rattles like a tractor. when i turn the a/c off it stops...dunno if it does it as the rpms increase i cant tell i have an exhaust leak...wtf could this be?