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JimSmith has it about right.
The following is from the air conditioning system manual (115 834 01 00): “For cooling the combination temperature vacuum switch must be moved from the lefthand stop to the right (this is your broken knob). Moreover, the blower switch (between the sliders like JimSmith said) must be switched on.”
Next is my paraphrasing:
The top sliders are the air volume control levers. Right one out gets air to your feet. Left one out puts air to the defroster vents. To the middle closes them.
The bottom sliders control the heat for the left and right sides of the car. In is cold, out is hot. The cartoon beneath the word 'DEF' shows how to get all the hot air to the defroster vents. At highway speeds you don't need the blower running to get heat, but remember that you do to get A/C. Somebody put the slider knobs on wrong: the red ones should be on the bottom (red for heat, blue for air). The fifth slider (above the center vents) gives extra air (unheated) through the dashboard vents. To the right is off. For me, figuring out that fifth slider and adjusting the heater valve cables was the difference between keeping daBenz stock or putting in the A/C from the parts car.
The combination temperature vacuum switch may be expensive as it controls both A/C temperature and the vacuum operated flappers that route air past the blower. Electrical connector at the back of the assembly. Getting there is the hard part, and I can't remember if there's a support box behind the radio or room behind the air intake next to the foot throttle or room to work a hand and a mirror under the dash. Otherwise you'll have to pull the console (the bottom bolt is under the center intake panel). Also, once you replace or repair that temperature switch, it is adjustable so you don't ice the evaporator.
I like your radio. Mine (1970 220D) is a BC/FM radio.
Good Luck,
daBenz
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