HVAC 20 EVAPORATOR COIL AND EXPANSION VALVE EVAPORATOR COIL It is a heat exchanger cum dehumidifier which absorbs heat and moisture of the air passing through it to give cold dehumidified air. As the refrigerant absorbs the heat it changes its state from liquid to vapour. A thermister (temperature sensor) is used to measure the temperature of the air passing over the evaporator in order to avoid icing. EXPANSION VALVE This valve controls the flow of refrigerant into the evaporator. It is used to expand the high pressure low temperature liquid. When the outlet temperature is high the refrigerant inside the sensing element expands to open the expansion valve opening such that more refrigerant flows. When the outlet temperature is low the expansion valve opening reduces to decrease to decrease the refrigerant flow. 10.1.5.3 ROOF AC UNIT (if fitted) The roof A.C. is mounted on your vehicle and the blower switch for this A.C. unit is located on roof liner above the second row seat for easy access to the occupants. Air flow direction can be adjusted by adjusting the air vent of outlet bezel. The roof AC can be switched on provided the front $& LV µ21¶ +RZHYHU WKH EORZHU RI WKH URRI $& XQLW can be operated independently
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