I am unsure if the Air Pump is the correct terminology, its the pump that is run off the accessory belt on the uppermost right side of the engine bay. Upon startup it is engaged and is getting rather noisey, I believe that a bearing is starting to fail because as soon as it disengages after about a minute, the noise ceases.

I have a feeling its only a matter of time before a replacement/rebuild is in store. Its a 92 500E BTW.

Thanks In Advance (TIA)