I don't know your model. If it were mine, I'd start by opening the blower assembly to 1. Be certain the fan cage is turning, and 2. Begin looking for blockage. Seems to me if the cage is turning, it should be moving air, and it should be coming out somewhere inside the car.

Anyone else that knows this model have an idea?

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Charles
1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/showthread.php?t=296386