99 Tahoe does not use freon. it takes r-134a. You can check or add at the green capped valve on the tube coming from the compressor. There are two different size valves that will prevent you from using the wrong one.
R134a freon...................
How much freon does 99 Tahoe with rear ac hold
The air conditioning Freon capacity for your 1999 Chevrolet Tahoe is five pounds. The manufacturer recommends that you never overfill the air conditioning Freon.
R134a
134a
2.7lbs
R134a
you need 8.00 oz. of oil and 2.25 lbs of freon
Peter Tahoe goes by Tahoe.
2 1/2 lbs.
On my 1996 Chevy Tahoe 5.7 liter 350 4x4 no rear A/C it is exactly 3.0 lbs.
3lbs 4 12oz cans