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A/C Pressure Zone "C" Diagnosis

WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. 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: Definition: The low and the high side pressures are both higher than normal.
  1. Were you sent here from the A/C System Performance Test? If so, go to next step. If not, see A/C PERFORMANCE TEST .
  2. With the engine idling, turn on the A/C. Inspect for proper cooling fan operation. See appropriate COOLING FANS article in ENGINES. Are the cooling fans on and operating properly? If so, go to next step. If not, go to step  5.
  3. Visually inspect for a restricted air flow condition, damaged condenser cooling fins or for missing or misaligned air baffles. Do the following 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. See appropriate COOLING FANS article in ENGINES. 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 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 EVACUATING & 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 A/C outlet air temperature after repairs are performed. Compare the pressures and outlet temperature to those listed in the A/C performance chart. See Figure-Figure . Are the readings within the specified ranges? If so, go to go to next step. If not, perform A/C PERFORMANCE TEST .
  10. Operate the system in order to verify the repair. Did you find and correct the condition? If so, system is okay. If not, see SYMPTOM DIAGNOSIS  under TROUBLE SHOOTING.
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