According to the 07 Refrigerant Oil Specifications an 99 GMC Yukon uses either 36 or 64 oz of refrigerant depending if the vehicle has rear ac. You can find more helpfull information about your vehicle ac system at www.idqusa.com.
3
4.25 lbs
1.75 lbs1.75 lbs
2 1/2 lbs.
On the 2003 Chevy Silverado 2500, the A/C system recharge capacity (R-134a) is: 1.6 lbs.
It's 3 lbs, 12 ounces for the T660, and that's what it should be for the T600, as well.
.9 lbs of freon
1.52 lbs of r134a freon...
The recommended freon capacity is 1.75 lbs
134a freon about 3 lbs max
1.75 lbs
3.0 lbs total , make sure to add 6oz-8oz of oil to your system for compressor lubrication