It will require the removal of the serpentine belt
Do you have strange noises coming from the front of your engine? More often than not the noise is coming from one or more worn bearings on the engine accessories or belt pulleys. Removing the serpentine belt may be the only way to really diagnose the noise. Kent will show you an example on this Mercedes E500.
Problem & Solution
Common among these chassis:
W123
W124
W126
W201
W202
W208
W210
W211
W220