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4.25 lbs
The 1999 Chevrolet suburban rear air-conditioning Freon capacity is five pounds. The manufacturer recommends that you never overfill the Freon capacity.
In the rear of the vehicle attached to the rear evaporator, you will need to remove the complete assembly to replace the expansion valve......
5.7 engine 17.2 qts. w/rear air 20 qts.
diagram for 1999 chev subarban air conditioner
I have 1998 chev suburban with rear air do they use two orifice tubes
Most likely this is the "Fresh Air Intake" door malfunctioning; rear AC's normally do not have the ability to draw fresh air, and normal AC system have fresh air intake that draws hot air from outside.
Try replacing your rear themostatic expansion valve. If it is plugged, refrigerant won't flow to the rear evaporator.
56 oz of R134a
There are separate expansion valves in the rear, so even if the front system is failing, the rear unit could still work normally.
Possible blockage in the rear air units expansion valve. I just replaced mine for the same reason.
The 1999 Chevrolet Suburban 1500 5.7 liter V-8 air check valve can be found on the firewall in the engine compartment. The air check valve will be on the drivers side of the firewall.