Mountaineer AWD V6-4.0L VIN K Flex Fuel (2003)
Compressor Clutch: Description and Operation
A/C COMPRESSOR AND CLUTCH ASSEMBLY
NOTE:
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Internal A/C compressor components are not serviced separately. The Visteon SC115 A/C compressor is serviced only as an assembly. The clutch
plate, clutch pulley and bearing, and clutch field coil are serviceable.
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Installation of a new suction accumulator is not required when repairing the air conditioning system except when there is physical evidence of
system contamination from a failed A/C compressor or damage to the suction accumulator.
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Vehicles equipped with Visteon fixed scroll A/C compressors may experience rapid refrigerant high side pressure fluctuations upon cold start-ups
and/or after refrigerant system recharges. These high side refrigerant fluctuations are characteristic of the Visteon fixed scroll compressor and not
an indication of a failing/failed A/C compressor.
The Visteon SC115 A/C compressor has the following characteristics:
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Tangential mount design three lugs.
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The single manifold block of the compressor manifold and tube assembly fits to the suction and discharge ports. Two O-ring seals are used for
sealing.
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An eccentric bushing is driven by the shaft of the A/C compressor.
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An orbiting scroll driven by the eccentric bushing compresses the refrigerant gas against the walls of the fixed scroll.
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Single reed-type discharge valve mounted on the back of the fixed scroll. There are no suction valves.
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Non-serviceable shaft seal fully supported on both sides by bearings.
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The A/C compressor uses PAG oil or equivalent. This oil contains special additives required for the A/C compressor.
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The A/C compressor oil from vehicles equipped with an Visteon SC115 A/C compressor may have some slightly dark-colored streaks while
maintaining normal oil viscosity. This is normal for this A/C compressor because of break-in wear of the scroll seals that can discolor the oil.
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Use standard oil matching procedures when installing new compressors.
The magnetic A/C clutch has the following characteristics:
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It drives the compressor shaft.
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When battery voltage is applied to the A/C compressor clutch field coil, the clutch plate and hub assembly is drawn toward the A/C clutch pulley.
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The magnetic force locks the clutch plate and hub assembly and the A/C clutch pulley together as one unit, causing the compressor shaft to rotate.
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When battery voltage is removed from the A/C compressor clutch field coil, springs in the clutch plate and hub assembly move the clutch plate
away from the A/C clutch pulley.
