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A/C Pressure Zone "C" Diagnosis

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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).
  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 DESCRIPTION AND OPERATION in COOLING SYSTEM 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 restricted air flow, damaged condenser cooling fins and Inspect for missing or misaligned air baffles. Do the listed 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 engine/cooling system 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. 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 complete, go to next step.
  9. Record the low and high side pressures and the I/P outlet air temperature after repairs are performed. Compare the pressures and outlet temperature to those listed in the A/C Performance Table. See Figure or Figure . Are the readings within the specified ranges? If so, go to next step. If not, see A/C SYSTEM PERFORMANCE TEST  under PERFORMANCE TESTS.
  10. Operate the system in order to verify the repair. Did you find and correct the condition? If so, system is okay. If not, go to SYMPTOM TESTS .
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