Major system components: A/C compressor, compressor clutch, orifice tube or expansion valve, condenser, evaporator, accumulator or receiver/drier, low-pressure safety switch, HVAC fan, fan resistor block or blower control module, automatic climate control module, interior air temperature sensor, sunload sensor, refrigerant, refrigerant hoses, fittings and o-ring seals and heater core.
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