Viper SRT-10 V10-8.4L (2008)
Refrigerant Pressure Sensor / Switch: Testing and Inspection
A/C LOW PRESSURE SWITCH
NOTE: 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.
Before performing diagnosis of the A/C low pressure switch, be certain that the switch is properly installed on the accumulator fitting. If the switch is not
properly installed, it may not open the Schrader-type valve in the accumulator fitting, which will prevent the switch from correctly monitoring the
refrigerant system pressure.
Verify that the refrigerant system has the correct refrigerant charge See: Heating and Air Conditioning/Service and Repair/Refrigerant System Charge.
1. With gear selector in Neutral and park brake set, start engine and allow to idle.
2. Place the A/C-heater mode control switch in any A/C position.
3. Disconnect the wire harness connector from the A/C low pressure switch.
4. Using a suitable jumper wire, install the wire between the two terminal cavities of the A/C low pressure switch wire harness connector. The A/C
compressor clutch should engage.
5. If the A/C compressor clutch does not engage, the A/C compressor clutch, A/C compressor clutch relay, A/C-heater mode control switch, A/C
pressure transducer, PCM, fuses or related wiring circuits may be defective .
6. If the A/C compressor clutch does engage, connect a manifold gauge set to the low side refrigerant system service port .
7. Check for continuity between the two terminals of the A/C low pressure switch. There should be continuity with a suction pressure reading of 241
to 269 kPa (35 to 39 psi) or above, and no continuity with a suction pressure reading of 131 to 141 kPa (19 to 21 psi) or below. If OK, test and
repair the A/C clutch, A/C clutch relay, A/C-heater control, A/C pressure transducer, PCM, fuses or related wiring circuits as required. If not OK,
replace the faulty A/C low pressure switch.
