Has anyone upgraded an older W124 to a later system that uses a filter for the air intake on the HVAC? What year did they make the filter system so that I might look at one? I know I have to clean and possibly clean my evap core and heater core so while I am doing that I would like to add a filter system to prevent future buildup fo crap.

Bud

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1987 300D Turbo, 175k mi., 1998 BMW 323i Convertible, 1997 F250 4x4 7.3L PSD