Durango 2WD V8-4.7L VIN N (2001)
Low Pressure Sensor / Switch: Testing and Inspection
Before performing diagnosis of the loss of charge switch, be certain that the switch is properly installed on the suction jumper line fitting. If the switch is
too loose it may not open the Schrader-type valve in the accumulator fitting, which will prevent the switch from correctly monitoring the refrigerant
system pressure. Remember that lower ambient temperatures 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 a/c loss of charge switch wire harness connector from the switch on the refrigerant system fitting.
3. Install a jumper wire between the two cavities of the loss of charge switch 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 loss of charge switch. There should be continuity with a suction pressure reading of 7 to 13
psi. If OK, test and repair the A/C switch sense circuit as required. If not OK, replace the faulty switch.
