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A/C Pressure Zone "C" Diagnosis

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Avoid contact with moving parts and hot surfaces while working around a running engine in order to prevent physical injury.
NOTE: Tools Required: ACR 2000 Air Conditioning Service Center (J-43600) or equivalent.
NOTE: DEFINITION: The low and the high side pressures are both higher than normal.
  1. Were you sent here from the A/C performance test? If so, go to next step. If not, go to A/C SYSTEM PERFORMANCE  under PERFORMANCE TESTS.
  2. Start the engine. Turn the A/C ON. Inspect for proper cooling fan operation. Are the cooling fans on and operating properly? If so, go to next step. If not, go to step  5.
  3. Visually inspect for the following:
    • Damaged condenser cooling fins.
    • Missing or misaligned air baffles.
    • Restricted air flow.
    Do any of these conditions exist? If so, go to next step. If not, go to step  6.
  4. Repair the air flow restriction. After repairs are completed, go to step  9.
  5. Repair the fault to the cooling fan operation. After repairs are completed, go to step  9.
  6. Feel the liquid line on both sides of the orifice tube. Are the temperatures on both side of the orifice tube similar? If so, go to next step. If not, go to step  8.
  7. Replace the damaged or faulty orifice Solenoid. See ORIFICE SOLENOID & SCREEN  under REMOVAL & INSTALLATION. After repairs are completed, go to step  9.
  8. Air is in the refrigerant system, or the system is overcharged. Refer to the view screen on the ACR 2000 Air Conditioning Service Center for foreign gas content in the refrigerant. Recover and recharge the A/C system. See RECOVERY/EVACUATION & RECHARGING in GENERAL SERVICING PROCEDURES article in GENERAL SERVICING. After repairs are completed, go to next step.
  9. Record the low and high side pressures and the instrument panel outlet air temperature after you have performed the repairs. Compare the pressures and instrument panel outlet air temperature to those listed in the A/C Performance table. See A/C PERFORMANCE SPECIFICATIONS (3.5L V6 ENGINE)  or A/C PERFORMANCE SPECIFICATIONS (4.0L V8 ENGINE)  table. Are the readings within the specified ranges listed in the table? If so, go to next step. If not, go to A/C SYSTEM PERFORMANCE  under PERFORMANCE TESTS.
  10. Operate the system in order to verify the repair. Did you correct the condition? If so, system is okay. If not, go to SYMPTOM DIAGNOSIS  under TROUBLE SHOOTING.
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