ML350 Air Filter and Blower Motor

First you have to remove the panel underneath the dash on the passengers side. From there you can access the blower motor; you'll need a T20 torx screwdriver. I believe there are 4 screws,maybe 5. There is one screw hiding on the back side of the blower housing that is a little tricky to get at. Also, you may want to clean/replace your A/C filter while you are down there.