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From The Saab Tech Wiki
If the air from the vents does not seem cold enough but the air conditionning is still working, the A/C may not have been recharged for a long time, or there may be small leaks in the system. Joints between pipes and hoses depend on o-ring seals which often dry out and lose their elastic properties after a few years. For best operation, the system should be evacuated, recharged, and tested for leaks every few years(4-6) by an A/C service professional who can be trusted, but adding refrigerant is a simple process with no special tools required.
==StepsChargine==Testing the pressure and recharging the A/C is an easy job. A pair of cotton gloves and safety glasses should be used, just in case some of the refrigerant escapes during the recharge.
===System Parts===
The low pressure port is located next to radiator near the battery. Fig. 1
[[File:90093AC_Recharge_02.jpg|thumb|Fig. 1 - Low Pressure Port]]
The high pressure port is located behind the grille, and should be avoided. Fig. 2
[[File:90093AC_Recharge_04.jpg|thumb|Fig. 2 - High Pressure Port]]
===Charging===
Auto part stores sell recharge kits which are basically a hose with two connections and a gauge in the middle. (example, Napa # BK7652982) Our cars use R134a refrigerant, and PAG-100 oil (NG900 w. Seiko-Seiki compressor) or PAG-46 oil (9-3 w. Sanden compressor)
Recharge the system through the low pressure port.
'''''NEVER try to connect a recharge kit to the high-pressure port behind the grille.''''' Fig. 2
It is best to stay away from the high-pressure port completely because of the likelihood of injury if the refrigerant should erupt from that side of the system.
