Neon L4-2.0L VIN C (1998)
Low Pressure Sensor / Switch: Testing and Inspection
The work area must not be below 21 °C (70 °F) to test the compressor clutch circuit.
1. With gear selector in park or neutral and park brake set, start engine and allow to idle.
2. Raise hood and disconnect low pressure cut off switch connector boot.
3. Using a suitable jumper wire, jump across the terminals inside wire connector boot.
4. If the compressor clutch does not engage, the cycling clutch switch, wiring, relay, or fuse can be defective.
5. If clutch engages, connect manifold gauge set. Read low pressure gauge. At pressure above 97 kPa (14 psi) and above, low pressure out off switch
will complete the clutch circuit. If the low pressure gauge reads below 140 kPa (20 psi), the system is low on refrigerant charge or empty due to a
leak. Refer to Service Procedures, System Leak Checking.
6. Install connector boot on switch and repeat Step 3. If the clutch does not engage, replace the low pressure cut off switch.
