02 211 chasis,has a mildew smell when the air is first turned on,a/c drains are working.Reminds me when we had problems with 201 chasis.Service info notes leakage/seepage at heater core o rings,this does not smell like coolant or a/c oil from a leaking a/c evap.I do not want to spray frigi/wurth spray as it just seems to just mask and actually smells worse(in my opinion).........................................................any ideas???

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1982 300 td. 268k
1984 300d .345k
1986 190e 2.3 16v
1988 190e 2.3
1989 190e 2.6
1991 300e
1984 318i