Performance Test - Service Stall - HVAC System - Manual

Record the manifold gauge pressures, outlet temperature and ambient air temperature with the following preset vehicle conditions:

IMPORTANT: If the ambient air temperature is lower than 5° (40°F), the A/C compressor will not be enabled.

1. Install thermometer in right center outlet.
2. Open doors and windows to stabilize interior temperature with outside ambient air temperature.
3. Depress recirc button.
4. Set temperature knob to full cold.
5. Select 3rd blower speed.
6. Depress A/C button.
7. Engine fully warmed up and running at 2000 rpm.
8. Continue running until system pressures and outlet temperature stabilize. Usually five to seven minutes.
9. Record pressure and temperatures.
10. Compare readings to normal system performance charts then continue down diagnostic flow chart.