You sure can but try replacing the small fan start capacitor first. They go bad and won't start the fan more times than the fan motor goes bad.
If the old unit was a 10 SEER or less. If the old indoor coil has an expansion valve you should be fine but if it has an orifice type metering device then it should be replaced
The electric motor is probably bad if only the fan is not working. If you cannot hear the compressor running, either, then you may just have a tripped breaker, or the relay on the outside unit may be dirty. Ants like to get in those outside housings for the electronics; it's good shelter. The relay can be cleaned, and the breaker reset. If the motor is bad, it can be replaced. Call your local A/C service company.
No, that is just for cooling. The heat from inside is transferred to the outside unit and removed by the fan.
No the out side fan is for venting heat away fromt he unit.
Is the whole unit running or just the fan? My thermostat has the option to run the fan only at all times and also runs the fan when the temperature gets too high (or low) in the house.
yes
For an internal fan motor... I just paid right at around $400 to have ours replaced. Or if you replace it yourself. You be looking at only 50 to 100 dollars and not rocket science.
A fan clutch can't be tightened, just needs to be replaced.
If it is not supposed to blow air in that direction, the motor is going backwards. The run capacitor has probably failed. Unless the motor was recently replaced then it is either the wrong motor or it is miswired.
the aircondition fan is located in the outside unit of a central AC unit. It sucks outside cool air thru the fins and tubing that contains heat from air collected from inside the house thru the A-coil that's sitting on top of your heating unit. The inside fan in the heating unit blows air thru the cold air moving thru the fins and tubing in your A-coil and blows that air into your house. If you hold your hand above the outside unit while the fan is running you can feel the hot air that's coming from inside, this is how the heat is removed.
The inside fan blows air through the ac coils to cool the air. It should be on a separate breaker or fuse circuit from the outside unit. See if there is a fuse box on the side of the inside unit and check the breakers in the house main breaker box. Also stand quietly beside the inside unit and listen for the fan motor running. If the motor is heard running then either the fan drive belt has broken, or the ac coils are clogged preventing air from flowing.
The outdoor unit only runs in the AC mode(unless it is a heat pump). If you have the system off and the fan on, the outdoor unit should not be on. You can run the indoor fan only without harming the system.