Ok...I am dumb..but I don't have the owners manual so Ill ask..

What do alll the levers for the heat controls on the W115 300D do?

The red colored left and right ones?
The blue colored left and right ones?

What does sliding these in the various directions do?

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1976 300D
190,000 Miles
Colorado Beige

1975 300D
Parts Car
78,000 Miles
Rustbucket
Also Colorado Beige

1984 190D 2.2 (Dad's)
156,000 miles
Champagne Metallic Clearcoat