Ford 2003 Mustang Workshop Manual page 3180

The suction accumulator (19C836) is mounted to the A/C accumulator bracket (19D606) to the right of
the vehicle centerline. The inlet tube of the suction accumulator attaches directly to the A/C evaporator
core outlet tube and the outlet tube attaches to the A/C manifold and tube.
After entering the inlet of the suction accumulator, the heavier oil-laden refrigerant contacts an
internally mounted dome (which serves as an umbrella) and drips down onto the bottom of the
canister.
A small diameter oil bleed hole, in the bottom of the vapor return tube, allows the accumulated
heavier liquid refrigerant and oil mixture to reenter the compressor suction line at a controlled
rate.
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.
A fine mesh screened filter fits tightly around the bottom of the vapor return tube to filter out
refrigerant system contaminant particles.
A desiccant bag is mounted inside the canister to absorb any moisture which may be in the
refrigerant system.
A fitting located on the top of the suction accumulator is used to attach the A/C cycling switch. A
long-travel Schrader-type valve stem core is installed in the fitting so that the A/C cycling switch
can be removed without discharging the A/C system.
A/C Cycling Switch
The A/C cycling switch is mounted on a Schrader-type valve fitting on the top of the suction
accumulator.
A valve depressor, located inside the threaded end of the A/C cycling switch, presses in on the
Schrader valve stem.
This allows the suction pressure inside the suction accumulator to control the operation of the
A/C cycling switch.
The electrical switch contacts open when the suction pressure drops. The contacts close when
the suction pressure rises. For specifications regarding operating pressure(s), refer to
412-00 .
The A/C cycling switch will control the A/C evaporator core pressure at a point where the
plate/fin surface temperature will be maintained slightly above freezing.
This prevents icing of the A/C evaporator core and blockage of air flow.
It is not necessary to discharge the refrigerant system to remove the A/C cycling switch.
Dual-Function Pressure Switch (4.6L)
The dual-function pressure switch is used to interrupt A/C compressor operation in the event of high
Section