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Q:

add freon on 1999 Ford F-250 Super Duty

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
where do I add freon. I'm looking for the low side pressure port.
(1) Answer
I don't suggest doing this unless you're 100% sure the system is low on refrigerant and that you're not going to overcharge the system, otherwise you risk damaging the compressor and possibly more.
I recommend paying a shop to do this so it's done correctly.
Here are some near you
http://repairpal.com/directory?address=28383&car_brand_names=Ford