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The switchover (green arrow on black knob) performs two functions:
One, which you heard, is to operate a vacuum pot that redistributes airflow.
Second, it also switches current from the heat/defrost fan to the A/C fan.
If your fan works when you apply 12V to it, I'd suspect the switchover or the blower regulator, with more emphasis on the former.
Jim
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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles
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