Unplug the condenser from the plug on the outside of the home. Turn off the circuit breaker if there isn't a plug.
Remove the screw from the top of the condenser unit.
Lift up on the lid of the condenser to expose the fan. Turn the fan blades by hand. If they turn, then the fan blades need to be removed and replaced. Pull on the wire connectors and remove the screw to release the fan. Replace it using the take apart instructions.
Touch the fan motor. If it's hot or warm, the capacitor needs testing. Do not attempt to test the capacitor on your own; it holds a large amount of electricity even when turned off. Call a professional.
Remove the wires from the fan motor and remove the bolts. Replace the motor.