Only needed a short phillips head screwdrive to remove blower on my 1987. Had to remove the carpeted panel below the glove box (1991 has air bag) for access. Your car may require the removal of the lower dash knee pad/shelf, if it has one.

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Present
1987 300SDL
1991 300SL
1990 560SEL
2001 ML320

Past
1969 200D 1979-82
1983 300SD 1984-85
1972 250C 1982-02
1995 S350 2011
1997 S320 2012