Ranger 2WD V6-182 3.0L (1995)
Refrigerant Pressure Sensor / Switch: Description and Operation
A/C Pressure Switch
Refrigerant Containment Switch - R-134a System
A refrigerant containment switch is used on all models with air conditioning to interrupt A/C compressor operation in the event of high system
discharge pressures which could result in loss of refrigerant charge. The switch is located in the discharge line between the A/C compressor and the
A/C condenser core. The switch is sensitive to the discharge pressure and functions to interrupt the A/C compressor operation if the discharge pressure
exceeds a setting of 2751.1-3068.2 kPa (399-445 psi). The switch is a single function switch which only controls the circuit to the A/C cycling switch.
To introduce the subject of refrigerant flow, a simplified diagram follows which illustrates the pressure changes which take place in a typical
refrigerant circuit. The diagram also calls out the physical state of the refrigerant as it passes through the circuit.
