Full video instruction available: Video is specific to W211 chassis but applies to many others as well.https://mercedessource.com/store/cabin-air-filter-replacement-and-blower-motor-noise-troubleshooting-and-lubrication-demand
This happens on a lot of older (10 to 20 years) cars that do not get maintained properly. Just think what it is going to cost you to take it in for repair??? That is why you are living with it – RIGHT? You would be amazed at how often simple and cheap maintenance is neglected leading to poor heater blower performance and more expensive repairs down the road.
full video instruction available: Video is specific to W211 chassis but applies to many others as well.
Post time: May-28-2017