Auto Repairing 2004 Ford Excursion Air Conditioning System Operation Description
The refrigeration system operation is controlled by the following: the refrigerant system incorporates an a/c compressorcontrolled by an a/c cycling switch. The a/c cycling switch senses pressure in the suction accumulator to control operation of the a/c compressor. An a/c compressor pressure relief valve is installed in the a/c manifold and tube to protect thecompressor against excessively high refrigerant pressures. An a/c evaporator core orifice is installed in the evaporator inlet tube to meter the liquid refrigerant into the a/c evaporator core. A/c compressor and clutch assembly – visteon fs-10 note: internal a/c compressor components are not serviced separately. The visteon fs-10 a/c compressor is serviced only as an assembly. The a/c clutch disc and hub, a/c clutch pulley, a/c clutch field coil and the shaft seal are serviceable. Whenever a new a/c compressor is installed due to a failure that produces foreign material in the system, also install a new suction accumulator and the a/c evaporator core orifice. The visteon fs-10 a/c compressor has the following characteristics: a ten-cylinder swashplate design utilizing the tangential design mount. A one-piece lip-type seal (replaceable from the front of the a/ccompressor) is used to seal it at the shaft opening in the assembly. Five double-acting pistons operate within the cylinder assembly. The pistons are actuated by a swashplate that changes the rotating action of the shaft to a reciprocating force. Reed-type discharge valves are located between the cylinder assembly and the head at each end of the a/c compressor. The a/c compressor uses pag refrigerant compressor oil (r-134a systems) or equivalent. This oil contains special additives required for the a/c compressor.
The magnetic a/c clutch has the following characteristics: it drives the compressor shaft. When battery positive voltage (b+) is applied to the a/c clutch field coil, the clutch disc and hub assembly is drawn toward the a/c clutch pulley. The magnetic force locks the clutch disc and hub assembly and the a/c clutch together as one unit, causing the compressor shaft to rotate. When b+ is removed from the a/c clutch field coil, springs in the clutch disc and hub assembly move the clutch disc away from the a/c clutch pulley. A/c compressor pressure relief valve an a/c compressor pressure relief valve is incorporated in thecompressor manifold and tube to: relieve unusually high refrigerant system discharge pressure buildups. Prevent damage to the a/c compressor and other system components. Avoid total refrigerant loss by closing after the excessive pressure has been relieved. A/c condenser core the a/c condenser core has the following characteristics: it is an aluminum fin and tube design heat exchanger located in front of the vehicle radiator. It cools compressed refrigerant gas by allowing air to pass over fins and tubes to extract heat and condense refrigerant gas to liquid refrigerant as it is cooled. Refrigerant lines the condenser to evaporator tube contains high pressure liquid refrigerant upstream of the a/c evaporator core orifice.
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