A/C Cooling Performance Check

OBSERVE THE FOLLOWING

1. Do not park car in sunlight.
2. V-belt properly adjusted.
3. Condenser and radiator free of obstructions.
4. Air ducts for condenser and radiator properly installed.
5. Close valves on pressure test gauges.
6. Remove A/C refrigeration high pressure switch.
7. Connect line from high pressure test gauge to valve.
8. Connect line from low pressure test gauge to low pressure service valve on A/C compressor.
9. Run engine until warm.
10. Push A/C switch button and fresh air recirculation door button.
- Fresh air/recirculation door light lights.
- A/C compressor runs.
- Radiator cooling fan runs in stage one.
- Fresh air/recirculation door is closed.
11. Switch ignition OFF.

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).

Time Temperature Graph:

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

TEST PROCEDURE

1. Insert thermometer in center 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 at E (your base measurement) in relation to time period C.

NOTE: Temperature must not vary from graph by more than + 5°C (9°F). If specified values are not obtained:
- check that radiator cooling fan is operating on 2nd stage (high speed).
- check position of temperature flap arm on evaporator/heater housing.