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A/C Pressure Zone "C" Diagnosis

WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. 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.
  1. Were you sent here from the A/C SYSTEM PERFORMANCE TEST? If so, go to next step. If not, go to A/C SYSTEM PERFORMANCE TEST  under PERFORMANCE TESTS.
  2. With the engine idling, turn ON the A/C. Inspect for proper cooling fan operation. See appropriate ELECTRIC COOLING FANS article in ENGINE COOLING. 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:
    • Restricted airflow.
    • Damaged condenser cooling fins.
    • Inspect for missing or misaligned air baffles.
    Do any of the above conditions exist? If so, go to next step. If not, go to step  6.
  4. Repair the air flow restriction. After repairs are complete, go to step  9.
  5. Repair the cooling fan operation fault. After repairs are complete, go to step  9.
  6. Feel the liquid line on both sides of the orifice tube. Is the temperature the same before and after the orifice tube? If so, go to next step. If not, go to step  8.
  7. Replace the damaged/faulty orifice tube. See ORIFICE TUBE  under REMOVAL & INSTALLATION. After repairs are complete, go to step  9.
  8. Air is in the A/C refrigerant system, or the A/C system is overcharged. Refer to the view screen on the ACR 2000 Air Conditioning Center for foreign gas content in the A/C refrigerant. Recover and recharge the A/C system. See RECOVERY, EVACUATION & RECHARGING in GENERAL SERVICING PROCEDURES article in GENERAL SERVICING. After repairs are complete, go to step  9.
  9. Record the low and high side pressures and the I/P panel outlet air temperature after repairs are performed. Compare the pressures and the I/P panel outlet air temperature to those listed in the A/C Performance Chart. See Figure. Are the readings within the specified ranges? If so, go to next step. If not, go to A/C SYSTEM PERFORMANCE TEST  under PERFORMANCE TESTS.
  10. Operate the A/C 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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