Hello, recently my 1985 300D developed an issue where the blower will not turn on when it is hot outside, and the temperature dial is set to cold or MIN. It'll run when the dial is in the white or red (heater), but not blue. EC or AC, doesn't matter.

If the fan is set to high, it'll run for a bit, but then turn off after 30-60 seconds. Auto or Low, it doesn't turn on unless the dial is not in the blue.

Blue/Cold temperatures works when it is mild or cold out, but not when it is hot out.

In all circumstances, whether EC or AC, when set to blue or Min, the air is lukewarm, like the a/c isn't engaging.

Heater/hot settings works under all circumstances. Any insight on what could be causing this would be amazing. Thanks.

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1985 300D Turbo Diesel W123 Federal