Sounds like refrigerant OK and the side of a/c pressure switch that allows clutch to operate is OK, therefore let's assume other half of switch that works fans is OK too. Leads us back to thermal limiter on fan resistor.
BTW I presume time (ie length) of cycles; a/c clutch and fan are different, 'cause I believe there is an inherent delay before fan power is removed.
Well I spent some time reviewing the Ford manual and have become extremely frustrated by its errors/lack of clarity/lack of circuit descriptions. I have found this with other problems as well. You really have to confirm on the car what manual is/or is not, telling you.
If you want to troubleshoot yourself my suggestion is to measure volts across terminals of fan resistor/thermal limiter. and see if they vary between +12 and some lesser amount, coinciding with fan off after being on and fan running. Obviously you will measure zero to start with a/c off, when fan is not required to be on. The 12 volt reading would coincide with circuit interruption by thermal limiter in series with resistor.
Note: Although I've said terminals above you would actually measure at connector wires, green/white(+) and green/black(-), Haynes shows both wires as green/white.
Edit @ 8:20pm
