Time Test Method

Note:
This switch will cycle the compressor ON and OFF depending on the pressure in the refrigerant system.

A/C refrigerant low pressure switch is used to regulate interior temperature and prevent evaporator icing.

TESTING PREPARATIONS

1. Switch ignition ON.
2. Open doors.
3. Run fresh air blower for approximately 5 minutes on speed 4 to stabilize evaporator temperature.
4. Close sunroof, doors and windows.
5. Push A/C switch button ON.
6. Push fresh air/recirculation button.
- Fresh air/recirculation door closes.
- Indicator light ON.
7. Set temperature to full cold position.
8. Set fresh air blower speed to 4.
9. Open all instrument panel vents.
10. Adjust air distribution so all air comes only from instrument panel vents.
11. Place thermometer at air intake for heater/evaporator housing (under glove compartment).

A/C Refrigerant Low Pressure Switch Test Graph:

12. Measure temperature and match to closest temperature curve at E on graph.
This is your base measurement.

13. Adjust fresh air blower speed (F on graph) according to selected temperature curve at E.

TEST PROCEDURES

1. Insert thermometer in canter vent.
2. Start engine. After approximately 30 seconds, raise idle speed to 2000 RPM.

This Starts the Test Time Period.

3. Measure temperature at center vent.
4. Compare temperature at center vent with temperature from selected curve B (your base measurement) in relation to time period C.
5. Read temperature from center when A/C compressor clutch disengages (D on graph)
6. Compare temperature with temperature curve you have chosen on graph.
- A/C compressor clutch must disengage at point indicated on graph for the temperature curve you have selected (your base measurement) + 5°C (9°F) tolerance.