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CAUTION: • Liquid refrigerant is corrosive to metal sur- faces. Follow the operating instructions supplied • Never add R-12 to a refrigerant system designed to use R-134a. Damage to the system will • R-12 refrigerant oil must not be mixed with R-134a refrigerant oil. They are not compatible. • Do not use R-12 equipment or parts on the R-134a system. Damage to the system will result. • Do not overcharge the refrigerant system. This will cause excessive compressor head pressure • Recover the refrigerant before opening any fit- ting or connection. Open the fittings with caution, • Do not remove the secondary retention clip from any spring-lock coupler connection while the • The refrigerant system must always be evacu- ated before charging. • Do not open the refrigerant system or uncap a replacement component until you are ready to ser- • Before disconnecting a component, clean the outside of the fittings thoroughly to prevent con- • Immediately after disconnecting a component from the refrigerant system, seal the open fittings • Before connecting an open refrigerant fitting, always install a new seal or gasket. Coat the fitting • Do not remove the sealing caps from a replace- ment component until it is to be installed. • When installing a refrigerant line, avoid sharp bends that may restrict refrigerant flow. Position the • Tighten refrigerant fittings only to the specified torque. The aluminum fittings used in the refriger- • When disconnecting a refrigerant fitting, use a wrench on both halves of the fitting. This will pre- • Refrigerant oil will absorb moisture from the atmosphere if left uncapped. Do not open a con- • Keep service tools and the work area clean. Contamination of the refrigerant system through COOLING SYSTEM REQUIREMENTS To maintain the performance level of the heating- air conditioning system, the engine cooling system The engine cooling system includes the heater core and the heater hoses. Refer to Group 7 - Cooling Sys- REFRIGERANT HOSES/LINES/TUBES Kinks or sharp bends in the refrigerant plumbing will reduce the capacity of the entire system. High A good rule for the flexible hose refrigerant lines is to keep the radius of all bends at least ten times the There are two types of refrigerant fittings: refrigerant oil before installation. Use only O-rings • Unified plumbing connections with gaskets can- not be serviced with O-rings. The gaskets are not Using the proper tools when making a refrigerant plumbing connection is very important. Improper 24 - 2 HEATING AND AIR CONDITIONING XJ DESCRIPTION AND OPERATION (Continued) 2000 JEEP CHEROKEE |