WTF!?!? Everytime I wind the engine up past 3k rpm, I hear this annoying ass "whine" sound coming from the A/C vents. It is from the A/C system because it does not exhibit the same sound when the A/C is OFF. Anyone else have this similar problem? It's like a spinning whining sound whenever you rev the engine past 3k-4k rpm.

It never happened to my 2001 cls but this 2003 cls 6speed is exhibiting this problem.
TIA

 

I've heard this "swooshy zinging" type sound on my Auto around the same Rpms. I don't find it loud enough to be annoying though. Do you have CAI ?