The refrigerant they would use is R134a.
R134A
R134a
R134s freon
R134a
R134a
R134a
R134a
R134a
R134a
A 1999 Jeep uses R134a.
R134a freon.............
It depends on the year of the truck. The old type of freon was phased out. If its an older truck it would have been R-12. But R-12 is not avalible, you will have to convert it to R-134a. Newer trucks are R-134a.