Thank you! I reckon maybe I'm just surprised it makes so much noise compared to the regular airconditioning system I have in my other W124?This is normal....I often push the switch for Low fan because on Auto it stays too noisy messing around trying to sustain the temp you set. The only caveat there is in the winter, because Low won't give you enough heat throughout.
Truthfully, the Germans screwed the pooch on the ergonomics of this system.
It still doesn't explain the noise coming from the vacuum pod all of a suden though. Can anyone tell me what to do about it?