Ford Mustang (1999-2004) Service Manual: Dual-Function Pressure Switch (4.6L)
The dual-function pressure switch is used to interrupt A/C compressor operation in the event of high system discharge pressures.
- The dual-function pressure switch is mounted on a Schrader valve-type fitting on the high pressure side of the A/C manifold and tube.
- It is not necessary to discharge the refrigerant system to remove the dual-function pressure switch.
- A valve depressor, located inside the threaded end of the dual-function pressure switch, presses on the Schrader valve stem.
- This allows the dual-function pressure switch to monitor the compressor discharge pressure.
- 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.
The dual-function pressure switch has a second set of electrical contacts used for high-speed cooling fan control.
When 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.
- The refrigerant containment switch is mounted on a Schrader-type valve fitting on the high pressure side of the compressor manifold and tube assembly.
- A valve depressor, located inside the threaded end of the refrigerant containment switch, presses on the Schrader valve stem.
- This allows the refrigerant containment switch to monitor the A/C compressor discharge pressure.
- 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.
- It is not necessary to discharge the refrigerant system to remove the refrigerant containment switch.
Suction Accumulator
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
compres ...
Spring Lock Coupling
The spring lock coupling is a refrigerant line coupling held together by a
garter spring inside a circular
cage.
When the coupling is connected together, the flared end of the female
f ...
Other materials:
Pinpoint Tests
CAUTION: Before removing and installing the GEM or its connectors,
disconnect the battery. Failure to follow this caution will
result in the GEM storing many erroneous DTCs and
may result in the GEM exhibiting erratic operation after installation.
CAUTI ...
Battery Cables
Removal
WARNING: Batteries normally produce explosive gases which can
cause personal injury.
Therefore, do not allow flames, sparks or lighted substances to come
near the battery. When
charging or working near a battery, always shield your face an ...
Actuator - Door Lock
Removal
1. Remove the door trim panel (23942). For additional information,
refer to Section.
2. Remove the door latch (21812). For additional information, refer to
Latch-Door .
3. Remove the door ajar switch.
Release the locking tab.
4 ...
