Expedition 4WD V8-4.6L SOHC VIN W (1999)
Accumulator HVAC: Description and Operation
NOTE: Installation of a new suction accumulator/drier is riot 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/drier.
The suction accumulator/drier is mounted to the A/C accumulator bracket to the right of the vehicle centerline. The inlet lube of the suction
accumulator/drier attaches directly to the A/C evaporator core outlet tube and the outlet tube of the suction accumulator/drier attaches to the A/C
manifold and tube.
After entering the inlet of the suction accumulator/drier, heavier oil-laden refrigerant contacts an internally mounted dome (which serves as an umbrella)
and drips down onto the bottom of the canister.
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A small diameter oil bleed hole, in the bottom of the vapor return tube, allows the accumulated heavier liquid refrigerant and oil mixture to
re-enter the compressor suction line at a controlled rate.
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As the heavier mixture passes through the small diameter liquid bleed hole, it has a second chance to vaporize and recirculate through the A/C
compressor without causing compressor damage due to slugging.
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A fine mesh screened filter fits tightly around the bottom of the vapor return tube to filter out refrigerant system contaminant particles.
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A desiccant bag is mounted inside the canister to absorb any moisture which may be in the refrigerant system.
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A fitting located on the top of the suction accumulator/drier is used to attach the A/C cycling switch. A long-travel Schrader-type valve stem core
