Rough idle when A/C is on...
 

I have a 98 CLK 320 with about 85000 miles on it. Car runs fine except for the small vibration when I turn the A/C on. Any ideas? Motor mounts maybe? Thanks guys

If you mean a rougher and 'noisier' idle. That is exactly the problem I have in my '93 190E. The dealer diagnosed this as a worn tensioner shock. Pretty straight forward job, but am encountering some difficulty with removing a torx screw holding the top of the shock.

cheers, guenter