Central Air Conditioning Question – Fan Motor?

problem: when trying to heat the house no warm air blows (only cold) until after we turn the heat up enough for the coils in the furnance (emergency heat) to come on.
we had ac guys come out and they checked everything and replaced the capacitor.
this worked about a day and a half
exact same problem came back. we have not called anyone yet.
additonal info: last night i tried to cool the house, theromstat said it was cooling but no air at all was blowing. i walked out to the unit and i heard buzzing (i heard this when the ac guys were working on getting the heat going) and finally after about 5 minutes, the fan started turning.
i went back inside and cold air was blowing………. the fan outside quit turning again off and on.
the fan blade turns freely (i saw the guy check that so i checked it as well)
basically:
when heating: cold air blows until coils in furnace come on (emergency heat), it should at least be warm when you bump it up a few degrees
when cooling: no air blows until the fan outside starts turning which seems to be sporadic.
it seems that maybe instead of a capacitor maybe its another problem
if its the fan motor, i know i can replace that myself because i took it out a few years ago and oiled it no problem.
what does everyone think? i have an ohm tester but if you tell me to use it you will need to tell me exactly what setting to put it on and explain it to me like a 3rd grader
thanks in advance for any ideas or help!

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