GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2000 🢒 Cavalier 🢒 HVAC 🢒 Heating, Ventilation and Air Conditioning 🢒 Maintaining Chemical Stability

The life and efficient operation of the air conditioning system depends upon the chemical stability of the refrigeration system. When foreign materials contaminate the refrigeration system the following conditions occur:

    • Change the stability of the refrigerant changes
    • Change the stability of the compressor oil changes
    • Affect the pressure/temperature relationship is affected
    • The pressure/temperature efficiency reduces
    • Internal corrosion
    • Abnormal wear of the moving parts
        The following foreign materials may contaminate the system:
       - Dirt
       - Air
       - Moisture

In order to ensure chemical stability in the system, follow these general practices:

    • Before disconnecting a refrigerant connection, wipe away any dirt or oil at (and near) the connection in order to reduce the chance of dirt entering the system. Cap, plug, or tape both sides of the connection in order to keep out the following items:
       - Dirt
       - Foreign material
       - Moisture
    • Keep all of the tools clean and dry. This includes the following components:
       - The manifold gauge set
       - The replacement parts
    • When adding refrigerant oil, ensure that the following components are clean and dry in order to ensure that the refrigeration oil remains moisture-free:
       - The transfer device
       - The container
       - Refer to Refrigerant Oil Distribution .
    • When opening an A/C system, ensure that everything needed is close at hand. This ensures that as little time as possible is required to perform the operation. Do not leave the A/C system open any longer than is necessary.
    • Any time the A/C system is opened, properly evacuate the system before recharging with the refrigerant. Refer to Refrigerant Recovery and Recharging .

All of the service parts are dehydrated and sealed before the parts are shipped. Keep the parts sealed until just before the parts are needed. In order to prevent condensation in the air from entering the system, keep all of the parts at room temperature before any of the caps are removed. If the caps are removed but the parts are not installed, reseal the parts as soon as possible.