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If your lips get dried or or chapped from the fan blowing on you or if the fan makes the area super cold then it could possibly trigger a cold sore.
no.
why does the fan still run on the unit after it cycles is over. but it is blowing hot air not cold
The cold air makes your muscles contract.
Check the fan speed resistor mounted in the blower assy. it could be open or shorted!
does fan door motorized or on a vaccuum line when you switch from AC to defrost?
over heat
You need to check your fan. That is typically the usual source. If your fan isn't blowing or working, you aren't creating cold air.
yes it would be fine unless its really cold weather outdoors.
my air is cold, and car does not overheat but the fan does not work
If you feel no air blowing at all (when you are not moving) then your fan is not blowing. If it is blowing air, and it is cold, when the heater is on, then most probably your heater core is leaking, or is clogged. These are easily replaceable and go bad all the time in older cars.
There are a number of reasons why your body aches after the fan was blowing on you. It could have tightened your muscles.