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
The pinpoint tests are a step-by-step diagnostic process designed to
determine the cause of a condition. It may not always be necessary to follow a
pinpoint test to its conclusion. Carry out only the
steps necessary to correct the condition. Then, test the s ...
Engine Mount
Special Tool(s)
Support Bracket, Engine
303-639
3-Bar Engine Support Kit
303-F072
Alignment Tool, Subframe
502-004
...
Cleaning the windows and wiper blades
The windows and wiper blades should be cleaned regularly. If the wipers
do not wipe properly, substances on the vehicle’s glass or the wiper
blades may be the cause. These may include hot wax treatments used by
commercial car washes, water repellent coatings ...