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The blower circuit is turned on in the heating mode by a vacuum switch. The condition of blower in AC only usually means you have a large enough vacuum leak, or leaks, that the vacuum switch can't operate to engage the blower motor. I suggest that you get a mighty vac, or the Harbor Freight equivalent, and start checking your vacuum pods and lines for the leak. I went through this with my '79 a few years ago, and ended up installing the digital upgrade advertised in this forum, as I found not only bad pods, but the mechanical nightmare that is the heater servo was totally shot. I am extremely happy with the digital upgrade! Spendy, but it works very well.
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Richard Wooldridge
'01 ML320
'82 300D 4.3L V6/T700R4 conversion
'82 380SL, '86 560SL engine/trans. installed
'79 450SL, digital servo update
'75 280C
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