1988 BMW 528

Heater problem
1988 BMW 528 6 cyl Two Wheel Drive Manual 249000 miles

About 6 months ago, my wife and I were out, and I left her in the car running with the A/C on, when I returned, I noticed some smoke coming from the center vent. The A/C was no longer working, and now, here during the winter time, the heat comes out into the car, but the fan does not provide a powerful stream of heat, it even stops after a few minutes.
Is there a problem with the fan, or is it something else?
February 8, 2010.

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