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Hi guys

I'm new to mercedes so i've got a couple of questions,
!. when i start my 99 E200 for the first time of the day it soulds rough almost if its reseting its timing after about 2 - 3 sec she's fine and wont happen again till shes switched off for a few hours or mainly over night.
2. theres a wine coming from the back sounds like its comming from the diff but only seems to be between 60 and 50 mile per hour when i come off the gas
3. last of all the compressor seems to be on all the time once the air is on is this mormall

Thanks for any help
 

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W210 E300TD
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Check the timing chain tensioner, it may be faulty.

The whine could be any number of things, but its likely drivetrain related.

The compressor should be left on all the time, it makes no difference to fuel consumption and lack of use will damage the AC system.
 
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