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A/C Pressure Zone "C" Diagnosis

WARNING: This page is about a different car, the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. 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: For circuit reference, see CONNECTOR IDENTIFICATION  and/or WIRING DIAGRAMS  .
NOTE: Tools Required: ACR 2000 Air Conditioning Service center (J-43600).
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 PERFORMANCE TEST  under PERFORMANCE TESTS.
  2. With the engine idling, turn the A/C on. Inspect for proper cooling fan operation. Is the cooling fan and fan clutch operating properly? If so, go to next step. If not, go to step  5.
  3. Visually inspect for restricted air flow or damaged condenser cooling fins and inspect for missing or misaligned air baffles. Do the specified 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 refrigerant system, or the system is overcharged. Check 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 I/P outlet air temperature after repairs are performed. See A/C SYSTEM PERFORMANCE SPECIFICATIONS - WITH FRONT A/C  or A/C SYSTEM PERFORMANCE SPECIFICATIONS - WITH REAR A/C  tables. Are the readings within the specified ranges? If so, go to next step. If not, go to A/C PERFORMANCE TEST .
  10. Operate the system in order to verify the repair. Did you correct the condition? If so, system is okay. If not, go to step  2.
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