Excursion 2WD V8-5.4L SOHC VIN L (2000)
If the ACCS signal is not received by the PCM, the PCM circuit will not allow the A/C to operate. For additional information, refer to PCM outputs,
wide open throttle air conditioning cutoff.
NOTE: The Town Car, Continental, LS6/LS8 and Windstar do not have a dedicated (separate) input to the PCM indicating that A/C is requested.
This information is received by the PCM through the BUS + and BUS - (SCP) communication.
Air Conditioning High Pressure Switch
Typical Air Conditioning Pressure Sensor
The A/C pressure cut-off switch is used to interrupt the A/C compressor operation in the event of high system discharge pressures.
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The A/C pressure cut-off switch is mounted on a Schrader valve-type fitting on the high pressure side of the A/C manifold and tube.
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A valve depressor, located inside the threaded end of the A/C pressure cut-off switch, presses on the Schrader valve stem.
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This allows the A/C pressure cut-off switch to monitor the compressor discharge pressure.
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When the compressor discharge pressure rises to approximately 3103 kPa (450 psi), the switch contacts open, disengaging the A/C compressor.
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When the pressure drops to approximately 1793 kPa (260 psi), the contacts close to allow operation of the A/C compressor.
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It is not necessary to discharge the refrigerant system to remove the A/C pressure cut-off switch.
