How early was the one you saw with no AC? I think my car may have come with out it because the panel where the factory AC knob is located is bare in this car other than the hole somebody drilled to mount the aftermarket AC controls.

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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