System Operation

Switching "ON" the A/C system will activate the refrigerant circuit. The solenoid coil receives power, producing a magnetic field causing the armature clutch plate to be pulled, and which is fixed onto the compressor shaft next to an inner plate operating freely on the same shaft. The compressor increases refrigerant vapor pressure, which is drawn into the suction end of the compressor assembly. The refrigerant is then compressed, raising refrigerant vapor temperature. The high pressure vapors pass through a high pressure line to a condenser located inline with the engine radiator. This high pressure, hot refrigerant is cooled by air flow provided by an additional fan.
When the refrigerant vapors reach a predetermined temperature, the vapors condense, cool and are supplied to the tank/drier assembly. The refrigerant flows from the drier assembly to an expansion valve, which meters refrigerant volume. Refrigerant rate is controlled by the temperature and pressure of the evaporator outlet. The evaporator further cools the refrigerant flow, in turn cooling the blower supplied fresh air passing around the evaporator assembly and which is finally fed into the passenger compartment through air ducts.
Moisture from fresh or circulating air flowing past the evaporator, condenses. The condensation is discharged through a rubber hose on the transmission and could cause a puddle under the vehicle. This is a completely normal condition and does not indicate a leak.
If water should freeze on the evaporator a temperature switch with a capillary sensor stops the refrigerant circuit and the frozen water on the evaporator melts. Once water is melted the temperature switch then releases power flow and the circuit is operated again. This is done to prevent damage to the refrigerant system from icing-up conditions.