I've spent the last hour using the search feature, hoping to get a better understanding of the cryptic climate control buttons on my '84 300TD wagon.

I bought the wagon with no belt on the A/C compressor, no pressure in the lines and a blower with worn out brushes. I am in the middle of sorting all that out, but I still don't have an understanding of the basic controls.
I should have the blower working in a few days once my replacement brushes have arrived, and I hope to start diagnosing the A/C system soon after the blower blows.

However, the enigmatic climate controls remain a mystery to me.
Can anyone please help me find a picture guide to what the buttons are supposed to do?

Many thanks!
-steve

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1984 300TD wagon with heated dual-tank WVO.