Cadillac Repair: 1993 Cadillac Deville with no heat, cadillac deville, heat fan

Question
Fan runs, but air is not warm at all from the heater.  What should I do to trouble shoot?

Answer
Most likely a PROGRAMMER fault.

1. Remove the glove box liner and look for a metal rod that you will see moving back and forth as you switch from full heat to full A/C. If this rod does NOT move about 4" in both directions the programmer is most likely at fault.