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Mobile air-conditioning systems consist of five refrigeration circuit component groups:<BR><BR>1.) Compressor, mount and drive.<BR>2.) Evaporator and blower assembly.<BR>3.) Condenser.<BR>4.) Hoses.<BR>5.) Drier/accumulator.<BR><BR>Follow the refrigerant cycle to better understand how it works:<BR>The compressor pumps hot low-pressure vapor refrigerant being cycled back from the evaporator. <BR>In the compressor, the refrigerant changes state as the low-pressure vapor is compressed in to a high-pressure vapor and then pumped into the condenser.<BR>The high-pressure vapor is hotter than the outside, (ambient) temperature and this additional heat is removed as it passes through the condenser.<BR>As the high-pressure vapor temperature drops, it changes state again, and condenses into a high-pressure liquid and is passed on to the drier where it is filtered, dried, and stored. A pick up tube in the bottom of the drier assures that a solid stream of vapor less liquid refrigerant is passed to the expansion valve.<BR>The expansion valve, via a fixed or variable orifice, regulates the flow of high-pressure liquid refrigerant into the evaporator. <BR>The pressure of the evaporator is roughly ten times lower than that of the high-pressure liquid at the expansion valve inlet allowing the refrigerant to expand quickly and boil. <BR>As the refrigerant flows though the evaporator coils, forced air is being blown across the evaporator fins from the blower motor, the low-pressure vapor expands, boils and absorbs heat from the passenger compartment.<BR>This action results in cooler air being routed through the distribution box and on the dash vents.<BR>The hot low-pressure vapor is passed on to the compressor to cycle through the system again.
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