2003 FORD MUSTANG Workshop Manual

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Page 3177 of 4378

FORD MUSTANG 2003 Workshop Manual An A/C compressor pressure relief valve is incorporated into the compressor A/C manifold and tube to:
�zrelieve unusually high refrigerant system discharge pressure buildups. For specifications
rega

Page 3178 of 4378

FORD MUSTANG 2003 Workshop Manual A/C Evaporator Core
NOTE:
The evaporator core is not separately serviceable, it is serviced only with the evaporator core
housing assembly.
NOTE: Installation of a new suction accumulator is not

Page 3179 of 4378

FORD MUSTANG 2003 Workshop Manual �z
Adjustment or repair cannot be made to the evaporator core orifice assembly. A new evaporator
core orifice must be installed as a unit.
Suction Accumulator
NOTE: Installation of a new suction a

Page 3180 of 4378

FORD MUSTANG 2003 Workshop Manual 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 evap

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.
zA 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.
z 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.
z A fine mesh screened filter fits tightly around the bottom of the vapor return tube to filter out
refrigerant system contaminant particles.
z A desiccant bag is mounted inside the canister to absorb any moisture which may be in the
refrigerant system.
z 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.
zA valve depressor, located inside the threaded end of the A/C cycling switch, presses in on the
Schrader valve stem.
z This allows the suction pressure inside the suction accumulator to control the operation of the
A/C cycling switch.
z 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 Section 412 - 00 .
z 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.
z This prevents icing of the A/C evaporator core and blockage of air flow.
z 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 Klj . 7 ba
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FORD MUSTANG 2003 Workshop Manual system discharge pressures.
�zThe dual- function pressure switch is mounted on a Schrader valve- type fitting on the high
pressure side of the A/C manifold and tube.
�z It is not necessary to disch

system discharge pressures.
zThe dual- function pressure switch is mounted on a Schrader valve- type fitting on the high
pressure side of the A/C manifold and tube.
z It is not necessary to discharge the refrigerant system to remove the dual- function pressure
switch.
z A valve depressor, located inside the threaded end of the dual- function pressure switch,
presses on the Schrader valve stem.
z This allows the dual- function pressure switch to monitor the compressor discharge pressure.
z When the compressor discharge pressure rises, the switch contacts open, disengaging the A/C
compressor. When the pressure drops, the contacts close to allow operation of the A/C
compressor. For specifications regarding operating pressure(s), refer to Section 412 - 00 .
The dual- function pressure switch has a second set of electrical contacts used for high- speed cooling
fan control.
zWhen the compressor discharge pressure rises, the contacts close and engage the high speed
fan control. When the pressure drops, the contacts open and the high speed fan control is
disengaged.
Refrigerant Containment Switch (3.8L)
The refrigerant containment switch is used to interrupt A/C compressor operation in the event of high
system discharge pressures.
zThe refrigerant containment switch is mounted on a Schrader- type valve fitting on the high
pressure side of the compressor manifold and tube assembly.
z A valve depressor, located inside the threaded end of the refrigerant containment switch,
presses on the Schrader valve stem.
z This allows the refrigerant containment switch to monitor the A/C compressor discharge
pressure.
z When the A/C compressor discharge pressure rises, the switch contacts open, disengaging the
A/C compressor. When the pressure drops, the contacts close to allow operation of the A/C
compressor. For additional information regarding operating pressure(s), refer to Section 412 -
00 .
z It is not necessary to discharge the refrigerant system to remove the refrigerant containment
switch.
Spring Lock Coupling Item Part Number Description
1 — Plastic indicator ring (part of 19D690) Klj . 8 ba
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Page 3182 of 4378

FORD MUSTANG 2003 Workshop Manual The spring lock coupling is a refrigerant line coupling held together by a garter spring inside a circular
cage.
�zWhen the coupling is connected together, the flared end of the female fitting slips

Page 3183 of 4378

FORD MUSTANG 2003 Workshop Manual The fitting is an integral part of the refrigeration line or component.
�zSpecial couplings are required for both the high side and low side service gauge ports.
�z A new Schrader- type valve core c

Page 3184 of 4378

FORD MUSTANG 2003 Workshop Manual DIAGNOSIS AND TESTING
Air Conditioning
Refer to
Section 412 - 00 .
SECTION 412-
03: Air Conditioning 2003 Mustang Workshop Manual Klj . 1 ba
12003 Mustang Workshop Manual
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