I've got a 2007 CLK550 that emits a loud whining noise whenever I cold start with the A/C on. Once the engine warms up and the A/C slows up a bit the whining decreases. I've asked the dealer about it but they just shrug it off & say it's normal. It's difficult to demonstrate as whenever I'm at the dealer the engine is warmed up and doesn't exhibit the excessive noise. I would appreciate any advice as to what's causing the noise.
Bstuttman