My new HVAC units have a timer in the control board for the inside air handler, 
so the blower fan stays on for about a minute after the outside unit shuts off. 
 It also delays blowing air for a bit after the outside unit starts.

I think your air handler control board is either faulty or getting a bad signal 
from the thermostat, if your system is anything like mine.

A new control board is probably cheaper than a service call, maybe swap in a 
new board first?
Max Dillon
Charleston SC
'87 300TD
'95 E300

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