I do also have a problem with my W210 A/C, which I suspected to be due to low refrigerant: blown air is not very cold. Went to a workshop, they tested the pressure in the lines with a hand gauge, stuck an electronic thermometer in the dash vents, read some codes and claimed it works fine. However, although the blower motor blows as it should, air is just moderately cold while in other Mercs, namely the W204, it nearly freezes inside. If there is refrigerant, pressure OK, blower motor OK, what should it be? Are the cabin filters to be changed?

~Nautilus

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1990 260E Sportline (that's 300E 2.6 for our American friends) -> sold
2001 E320 4Matic Elegance -> my Dad's daily drive
2005 Seat Leon FR 1.8T