Did some 240Ds come with out AC? One of my '79 240Ds has definite signs of an aftermarket AC system being installed...did they replace the original or was it an add on?

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine