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45 Mph A/C Performance Test

WARNING: This page is about a different car, the 2002 Saturn LW300, 2002 Saturn LW200, 2002 Saturn L300, 2002 Saturn L200, and 2002 Saturn L100. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Performing the 45 MPH A/C performance test will require that an assistant drive the vehicle so you can monitor and record the gauge reading. Routing of the gauge hoses must be done in such a manor that the hood can be fully closed and secured before test driving. Care must also be taken to ensure that hoses do not interfere with any moving parts (throttle cable or linkages, belts, pulleys, etc.).
NOTE: A Tech 2 with version 19.005 or higher software is required to perform this test.
  1. Install a manifold gage set to high and low side service ports and route hoses so that gages can be read from inside vehicle with hood closed.
  2. Start engine and turn A/C to OFF position - A/C button indicator light is off.
  3. Select outside air - recirculation button indicator light is off.
  4. Install thermometer into right center outlet.
  5. Set mode knob to I/P VENT position - full counter-clockwise.
  6. Set temperature knob to full COLD position - full counter-clockwise.
  7. Set blower to third speed - M2.
  8. Connect Tech 2 to data link connector (DLC).
  9. Using Tech 2, verify engine is operating at 188°F (87°C) or greater.
  10. For 2.2L models, use appropriate Tech 2 special function to set engine cooling fan speed to medium.
    • Select HVAC PERFORMANCE SPECIAL FUNCTION and press enter. Display should indicate fans are operating at MED.
    • Turn A/C to ON position - A/C button indicator light is illuminated.
  11. For 3.0L models, use appropriate Tech 2 special function to set engine cooling fan speed to MEDIUM.
    • Select FAN CONTROL 1 and press enter.
    • Command fan control ON. Display should indicate fans are operating at MED.
    • Turn A/C to ON position - A/C button indicator light illuminated.
    12. NOTE: Allow A/C system pressures to stabilize before beginning test.
  12. Drive vehicle at 45 MPH (72 km/h).
  13. Record A/C system pressures and outlet temperature every minute for 5 minutes.
  14. Release Tech 2 control of engine cooling fans.
  15. Compare readings to system performance table and perform additional diagnostics as required. See A/C SYSTEM PERFORMANCE SPECIFICATIONS  .
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