A 1999 model year vehicle uses R134a refrigerant (it's only Freon if it's manufactured by DuPont, who trademarked the name).
R134a.
Where do I put freon in a 2007 chevy impala
What Ac refrigerant freon is required in 1989 BMW 7-Series? What Ac refrigerant freon is required in 1989 BMW 7-Series?
Freon is R12. Your 1997 Chevy uses R134 Refrigerant.
R134a
2.4 lbs (1.1 kg) of R-134A refrigerant.....
R134a refrigerant.
R134a Refrigerant
134A freon
It contains no Freon. It contains R134 Refrigerant. If it is low, that means it has a leak. It is illegal to add refrigerant without first repairing the leak. Take it to a professional for repair and recharge.
R134a
There is no Freon in a 2007 vehicle. It uses R134a refrigerant. The resivoir is the entire system.