GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 Safari - 2WD 🢒 HVAC 🢒 Heating, Ventilation and Air Conditioning 🢒 Handling of Refrigerant Lines and Fittings

Caution: Avoid breathing the A/C Refrigerant 134a (R-134a) and the lubricant vapor or the mist. Exposure may irritate the eyes, nose, and throat. Work in a well ventilated area. In order to remove R-134a from the A/C system, use service equipment that is certified to meet the requirements of SAE J 2210 (R-134a recycling equipment). If an accidental system discharge occurs, ventilate the work area before continuing service. Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

    • Ensure that the metal lines do not exhibit the following conditions.
        This will prevent the loss of system capacity due to line restriction:
       - Dents
       - Kinks
    • Do not bend the flexible hose line to a radius of less than 4 times the diameter of the hose.
    • Do not allow the flexible hose line to come within a distance of 63.5 mm (2 ½ in) of the exhaust manifold.
    • Inspect the flexible hose lines regularly.
        Replace the flexible hose line with new hose if one of the following conditions exist:
       - Leaks
       - Brittleness
       - Deterioration
    • Before disconnecting any fitting in the refrigeration system, recover all of the refrigerant from the system. Refer to Refrigerant Recovery and Recharging .
    • Once you open a refrigerant line to the atmosphere, cap or tape the line immediately.
        This will prevent any of the following items from entering the line:
       - Moisture
       - Dirt
    • Use the proper wrenches when you make connections on the O-ring fittings.
        Back-up the opposing fitting with a wrench in order to prevent distortion of the following areas:
       - The connecting lines
       - The components
    • Tighten all of the tubing connections to the specified torque.
        Too much or too little torque may result in the following conditions:
       - Loose joints
       - Deformed joint parts
       - Refrigerant leakage
       - An inoperative A/C system
    • Ensure that the flat washer, O-rings and the seats are in perfect condition.
        A burr or a piece of dirt may cause a refrigerant leak.
    • Install new O-rings that you have lubricated with clean 525 viscosity refrigerant oil.
        Do not wipe the threads with a cloth.
    • Keep PAG synthetic refrigerant oil off fitting threads. Long term contact of PAG synthetic oil on threads may cause future disassembly difficulties.