Cougar/XR7 V8-4.6L VIN W (1997)
Accumulator HVAC: Description and Operation
NOTE: Replacement of the suction accumulator/drier is necessary any time a major component of the refrigerant system is replaced. Major components
include the following:
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A/C condenser core.
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A/C compressor.
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A/C evaporator core.
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a refrigerant hose/line.
An A/C evaporator core orifice or O-ring seal is not considered a major component but the A/C evaporator core orifice should be replaced whenever the
A/C compressor is replaced for lack of performance.
The suction accumulator/drier is mounted to the engine side of the dash panel on the RH side of the vehicle center line.
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The inlet tube of the suction accumulator/drier attaches directly to the A/C evaporator core outlet tube.
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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 re-circulate 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 mount the A/C cycling switch. A long-travel Schrader-type valve stem core
is installed in the fitting opening to prevent refrigerant loss when the A/C cycling switch is removed.
