2003 FORD MUSTANG refrigerant type

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
102003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

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
102003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

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 behind the
garter spring inside the cage of the male fitting.
z The garter spring and cage then prevent the flared end of the female fitting from pulling out of
the cage.
z Three O- ring seals are used to seal between the two halves of the A/C condenser core
couplings. All other couplings have two O- ring seals.
z Use only the O- ring seals listed in the Ford Master Parts Catalog for the spring lock coupling.
z A plastic indicator ring is used on the spring lock couplings of the A/C evaporator core to
indicate, during vehicle assembly, that the coupling is connected. Once the coupling is
connected, the indicator ring is no longer necessary but will remain captive by the coupling near
the cage opening.
z The indicator ring may also be used during repair operations to indicate connection of the
coupling.
z An A/C tube lock coupling clip (19E746) may be used to secure the coupling but is not required.
Service Gauge Port Valves
The high- pressure service gauge port valve is located on the A/C manifold and tube.
The low pressure service gauge port valve is located on the suction accumulator. 2 — Female fitting (part of 19860)
3 19E746 A/C tube lock coupling clip
4 19E576 A/C tube lock coupling spring
5 — Cage (part of 19D690)
6 — O-
ring seals (part of 19D690) 7 — Male fitting (part of 19835)
Item Part
Number Description
1 19D702 A/C charging valve cap
2 19D701 Low pressure service gauge port valve (part of
19C836)
3 19D701 Schrader-
type valve 4 — O-
ring seal (part of 19D701) 5 19D701 High pressure service gauge port valve (part of Klj . 9 ba
102003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

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 can be installed if the seal leaks.
z Always install the A/C charging valve cap (19D702) on the service gauge port valves after
repairing the refrigerant system. 19D734)
6 19D702 A/C charging valve cap Klj . 10 ba
102003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

REMOVAL AND INSTALLATION
Condenser Core
Removal and Installation
NOTE:
If an A/C condenser core leak is suspected, the A/C condenser core must be leak tested
before it is removed from the vehicle. For additional information, refer to Section 412 - 00 .
NOTE: Installation of a new suction accumulator is not required when repairing the air conditioning
system except when there is physical evidence of contamination from a failed A/C compressor or
damage to the suction accumulator.
All vehicles
1. Recover the refrigerant. For additional information, refer to Section 412 - 00 .
2. Remove the pin- type retainers and remove the upper radiator sight shield.
3. Remove the air cleaner and air cleaner outlet tube. For additional information, refer to Section 303 - 12 .
4.6L (2V), 4.6L (4V) vehicles 4. Remove the bolts and position the coolant bottle aside.
SECTION 412-
03: Air Conditioning 2003 Mustang Workshop Manual Material
Item Specification
PAG Refrigerant Compressor
Oil (R-
134a Systems)
F7AZ- 19589- DA (Motorcraft YN-
12- C) WSH-
M1C231-
B Klj . 1 ba
52003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...

REMOVAL AND INSTALLATION
Condenser to Evaporator Line
Removal and Installation
NOTE:
Installation of a new suction accumulator is not required when repairing the air conditioning
system except when there is physical evidence of contamination from a failed A/C compressor or
damage to the suction accumulator.
1. Recover the refrigerant. For additional information, refer to Section 412 - 00 .
2. Remove the air cleaner outlet tube. For additional information, refer to Section 303 - 12 .
3. Raise the vehicle. For additional information, refer to Section 100 - 02 .
4. Remove the line bracket pin- type retainer.
5. Lower the vehicle.
6. Remove the nut and disconnect the fitting at the condenser. zDiscard the O- ring seal.
SECTION 412-
03: Air Conditioning 2003 Mustang Workshop Manual Material
Item Specification
PAG Refrigerant Compressor
Oil (R-
134a Systems)
F7AZ- 19589- DA (Motorcraft YN-
12- C) WSH-
M1C231-
B Klj . 1 ba
32003 Mustang Workshop Manual
18. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_5108/S3B~us~en~ ...