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HOMESERVICE MANUALSOLDSMOBILE2004BRAVADA AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 31 (HVAC SYSTEMS - MANUAL)PERFORMANCE TESTSA/C SYSTEM PERFORMANCE
2004 Oldsmobile Bravada AWD

A/C System Performance

2004 Oldsmobile Bravada AWDSECTION A/C System Performance
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The ambient air temperature must be at least 60°F (16°C). Do not induce additional air flow across the front of the vehicle during the test. If you were sent here from a DTC diagnostic table, clear the DTC upon completion of this test.
  1. Park the vehicle inside or in the shade. Open the windows in order to ventilate the interior of the vehicle. If the A/C system was operating, allow the A/C system to equalize for 2 minutes. Ensure that the ignition key is in the OFF position. Install the ACR 2000 Air Conditioning Service Center. Record the ambient air temperature displayed on the ACR 2000 Air Conditioning Service Center. Record readings of the low and high side STATIC pressures. See A/C SYSTEM STATIC PRESSURE SPECIFICATIONS  table. Are both the low and high side pressures within the specified value? If so, go to next step. If not, check for a refrigerant leak. See LEAK TESTING in GENERAL SERVICING PROCEDURES article in GENERAL SERVICING.
    A/C SYSTEM STATIC PRESSURE SPECIFICATIONS

    Ambient Temperature Static Pressure - psi (kg/cm2  )
    Above 60°F (16°C) 50 (3.5)
    Above 75°F (24°C) 70 (4.9)
    Above 90°F (33°C) 100 (7.0)
    2. NOTE: Record the relative humidity and the ambient air temperature AT THE TIME OF THE TEST.
  2. Close the vehicle doors and windows. Open the driver door window 5-6" (12.7-15.2 cm). Select the following HVAC control setting:
    • The A/C is in recirculation mode, Automatic system.
    • The A/C is in Max mode, Manual system.
    • The Dual zone system is off.
    • The A/C is on.
    • The coldest temperature setting.
    • The maximum blower speed.
    • The I/P panel outlet mode.
    • The Passenger side of a Dual Zone HVAC control module is turned Off.
    • All I/P panel outlets are open.
    Install the temperature probes of the ACR 2000 Air Conditioning Service Center in the left and right center panel air outlets. Apply the parking brake. Place the transaxle in Park. Start the engine and raise the engine RPM to 2000 and maintain. Operate the A/C system for 5 minutes. Inspect A/C components for abnormal frost areas and unusual noises. When performing this step it is necessary to press the reset button on the ACR 2000 Air Conditioning Service Center before pressing the print button. Print the following information: The outlet air temperatures, the low-side pressure and the high-side pressure. Compare the low and high side pressures and the panel output temperatures to the tables below. See Fig 1 and Fig 2 . Does all the data recorded fall within the specified ranges of the tables below? If so, go to step  4. If not, go to next step.
  3. If the pressures and temperatures recorded do not fall within the specified ranges, continue to operate the A/C system for an additional 5 minutes, record the pressures and temperatures again. Compare the low and high side pressures and the output temperature to the tables below. See Fig 1 and Fig 2 . Does all the data recorded fall within the specified ranges of the tables below? If so, go to step  8. If not, go to next step.
  4. Do the high and low side pressures fall within the specified ranges but the panel outlet temperatures do not? If so, go to A/C PRESSURE ZONE "A" DIAGNOSIS . If not, go to next step.
  5. Is the low side pressure greater than the specified range, but the high side pressure within or less than the specified range? If so, go to A/C PRESSURE ZONE "B" DIAGNOSIS . If not, go to next step.
  6. Are the low and high side pressures both higher than the specified ranges? If so, go to A/C PRESSURE ZONE "C" DIAGNOSIS . If not, go to next step.
  7. Is the high side pressure greater than the specified range, but the low side pressure is within or less than the specified range? If so, go to A/C PRESSURE ZONE "D" DIAGNOSIS . If not, go to next step.
  8. Operate system to verify test results. If high and low-side pressures and panel outlet temperatures are within specified ranges, system is okay. If high and low-side pressures and panel outlet temperatures are not within specified ranges, diagnose by symptom. See SYMPTOM TESTS  under TROUBLE SHOOTING.
Fig 1: A/C Performance Table
G00189734Courtesy of GENERAL MOTORS CORP.
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