First, I did perform a search but could not find the same symptoms in the archives. My car's an '84 300sd. My blower only works when the temperature wheel is set to a cold setting. When I turn the on the heat, the blower will not turn on. It does not sound like a monovalve problem as I can feel warm air wafting through the vents, it's just the fact that the blower doesn't turn on. My climate control works fine on the cold settings.

Thanks