RAM 2500 Van V8-5.2L VIN Y (1998)
Low Pressure Sensor / Switch: Testing and Inspection
Fin Sensing Cycling Clutch Switch
Before testing the fin sensing cycling clutch switch, verity that the refrigerant system has the correct refrigerant charge. Also check that both the low and
high pressure cut-off switches are functional, and confirm that the compressor clutch is operational. Use a volt/ohmmeter to test the switch.
1. Turn the ignition switch in the On position. Place the heater-A/C mode control switch in any A/C position. Check for battery voltage at the fused
ignition switch output (run/start) circuit cavity of the fill sensing cycling clutch switch wire harness connector. If OK, go to Step 3. If not OK,
repair the open circuit to the fuse in the junction block as required.
2. With the ambient temperature between 20 to 30° C (68 to 900 F), start the engine and run the air conditioning system. The compressor clutch
should cycle on and off two to three times per minute. If the clutch fails to cycle at this rate in these temperatures, replace the faulty fin sensing
cycling clutch switch.
NOTE: If the ambient temperature is above 32° C (90° F) the compressor clutch may stay engaged and not cycle due to the high heat load. This
condition is normal.
