Ranger 4WD V6-4.0L (2009)
High Pressure Safety Valve HVAC: Description and Operation
High-Pressure Cutoff Switch
Air Conditioning
High-Pressure Cutoff Switch
The high-pressure cutoff switch is used to interrupt A/C operation in the event of high system discharge pressures.
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The high-pressure cutoff switch is mounted on a Schrader valve-type fitting on the high-pressure side of the compressor manifold and tube
assembly (3.0L and 4.0L engines) or the compressor to condenser discharge line (2.3L engine only).
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A valve depressor, located inside the threaded end of the high-pressure cutoff switch, presses on the Schrader valve stem.
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This allows the high-pressure cutoff switch to monitor the compressor discharge pressure.
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When the compressor discharge pressure rises, the switch contacts open, interrupting A/C operation. When the pressure drops, the contacts close.
For specifications regarding operating pressure(s), refer to Heating and Air Conditioning.
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It is not necessary to recover the refrigerant to remove the pressure cutoff switch.
