Durango 2WD V8-5.9L VIN Z LDC (2000)
Low Pressure Sensor / Switch: Testing and Inspection
Before performing diagnosis of the low pressure cut-off switch, remember that lower ambient temperatures, below about -1 °C (30 °F), during cold
weather will open the switch contacts and prevent compressor operation due to the pressure/temperature relationship of the refrigerant.
Also verify that the refrigerant system has the correct refrigerant charge.
1. Disconnect and isolate the battery negative cable.
2. Unplug the low pressure cut-off switch wire harness connector from the switch on the suction line jumper fitting.
3. Install a jumper wire between the two cavities of the low pressure cut-off switch wire harness connector.
4. Connect a manifold gauge set to the refrigerant system service ports.
5. Connect the battery negative cable.
6. Place the heater-A/C mode control switch knob in any A/C position and start the engine.
7. Check for continuity between the two terminals of the low pressure cut-off switch. There should be continuity with a suction pressure (low side)
reading of 48 to 193 kPa (15 to 28 psi) or above, and no continuity with a suction pressure reading of 90 kPa (13 psi) or below. If OK, test and
repair the A/C switch sense circuit as required. If not OK, replace the faulty switch.
