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412-01-7 Climate Control 412-01-7 DESCRIPTION AND OPERATION temperature of the refrigerant rises to a value between 70 °C and 110 °C. It passes to the condenser (1) under high pressure. At this point heat is drawn from the refrigerant by the air being forced past the cooling fins. Because of this heat loss, the refrigerant liquefies and leaves the condenser. The refrigerant then passes under high pressure to the refrigerant drier (8). This serves as a storage medium and filters out any moisture contained in the refrigerant. The expansion valve (6) regulates the quantity of refrigerant injected into the evaporator (5) as a function of the pressure and temperature in the evaporator. The liquid refrigerant is vaporized in the evaporator. This causes heat to be extracted from the air coming into the vehicle. The air 1 10 8 E129654 Item Description 1 Heater core 2 Evaporator 3 Expansion valve 4 A/C lines 5 A/C compressor 6 Condenser therefore cools down and the moisture it contained is given up at the evaporator core. The gaseous flow of refrigerant which comes out from the evaporator at low pressure enters the expansion valve at the upper opening, from where it is sucked in by the refrigerant compressor. The A/C pressure converter sensor sends an analog signal to the PCM. After evaluating the different input signals, the PCM sends a control signal to the A/C clutch relay, which engages and disengages the compressor clutch. The PCM input signals come from the blower motor switch via the evaporator temperature sensor (vehicles with manual temperature control), via the A/C module (vehicles with automatic temperature control), the A/C pressure converter sensor and the PCM. 2 3 4 5 6 7 Item Description 7 Refrigerant drier 8 Coolant Pump Heater lines