Refrigerant Pressure Sensor / Switch: Testing and Inspection

1. SET ON MANIFOLD GAUGE SET
2. DISCONNECT CONNECTOR
3. RUN ENGINE AT APPROX. 2,000 rpm
4. SET BLOWER SPEED CONTROL SWITCH TO "HI" POSITION
5. SET TEMPERATURE CONTROL LEVER TO "MAX. COOL" POSITION
6. A/C SWITCH ON




7. INSPECT PRESSURE SWITCH OPERATION
a. Connect the positive (+) lead from the ohmmeter to terminal 1 and negative (-) lead to terminal 2.
b. Check continuity between terminals when refrigerant pressure is changed, as shown in the illustration.
If operation is not as specified, replace the pressure switch.