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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1486 (Heating, Ventilation And Air Conditioning) >> Diagnostic Information and Procedures >> HVAC Vehicle Set-Up >> Performance Test - Service Stall

Performance Test - Service Stall

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
    IMPORTANT: If ambient air temperature is lower than 0° C (32° F), A/C compressor will not be enabled.
    IMPORTANT: This test must be performed in a service stall environment that protects the vehicle from wind that could cause incorrect pressure/temperature readings.
  1. Open hood and leave open during entire test.
  2. Install a manifold gage set to high and low side service ports.
  3. Disconnect vehicle thermal expansion valve (TXV) temperature sensor electrical connector and connect a temperature sensor that is exposed to ambient air.
  4. Start engine and warm to operating temperature. Use scan tool to verify coolant temperature is being thermostatically controlled approx. 88°C (190°F).
  5. Install thermometer into right center outlet.
  6. Open both front doors and windows to stabilize interior air temperature with outside ambient temperature.
  7. Press re-circulation button so that indicator light is lit.
  8. Set temperature knob to full cold position.
  9. Set mode knob to I/P outlet position.
  10. Set blower to third speed.
  11. Press A/C button.
  12. Using Tech 2, command fan to HIGH speed.
  13. Using accelerator pedal, increase engine speed to 2,000 RPM and hold.
  14. Continue running until system pressures and outlet temperature stabilizes. Usually 4 to 8 minutes.
  15. Record A/C system pressures and outlet temperature every minute for five minutes.
  16. Exit out of the scan tool test and return engine to idle.
  17. Release Tech 2 control of engine cooling fans.
  18. Compare recorded values to system performance charts then continue down diagnostic flow chart.
  19. When test is complete, re-connect the electrical connector for the vehicle TXV temperature sensor.
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