On a 92 LS sedan that I have, there is a slight buzzing sound that comes from the AC unit. The noise occurs regardless of whether the AC is on or not. As long as the ignition switch is in the second position, the unit will buzz. The strange thing is that the sound goes away if I'm making a right or left turn but comes back when I straighten out. Also at speeds above 60 mph, there is a low whine that I hear from the engine compartment when the AC is on. This whine goes away when the AC is off. Anybody know what it could be?