03’ International 9900i A/C not cooling well

[Rawze]

A lot of the time on internationals, the system gets cold enough but you can't feel it for stick. This is because as they get older, the blend doors are notorious for not closing all the way, causing the system to blow barely cold or luke-warm air all the time. Shutting off the heater-core lines with shut-off valves helps a lot, and replacing the blend door motors, etc. as necessary to force all the air across the evaporator and away from the heater core is usually the main issues if the rest of the system is checking out ok.