1979 240 D, 1993 500 SEL
I can't remember when I ever felt warm or cold air blowing out of the vents. At this time of year, I have temp set at 70, and if I put my hand up to the vents I can feel some warmth, but no current of air. Any suggestions or links as to how I approach diagnosing the problem? Could it be the blower motor? I need to consider DIY on this one, if possible.