There is one valve that is used to add refrigrant. But you had better not add Freon. Freon is R12 and your vehicle's A/C system does not have Freon (R12) as a refrigrant. More than likely it uses R134a.
Answering "Where do you add freon to your air conditioner in your ford ranger?"
how to add freaon in a 2003 ford escape
Freon is added in the low pressure port of the ac system. It is on an aluminum pipe on the passengers side, close to the ac drier.
Follow Larger hose from a/c compressor--may be near firewall next to drier
It is either on or near the recievr dryer in the right rear of the engine compartment. To corrrectly add freon, you need gauges and a refrigerant recovery system
How do you add freon to a 96 Ford Contour
on the low side only
On the suction side, the low side...................