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A/C Pressure Zone "B" 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. After continued operation of the A/C system, do the low and high side pressures equalize or become static? If so, go to step  5. If not, go to next step.
  3. Refer to the pressures recorded during the A/C SYSTEM PERFORMANCE TEST. Inspect for the following conditions:
    • The low side pressure equal to or above the specified pressure range of the A/C Performance Table.
    • The high side pressure is below the specified pressure range of the A/C Performance Table.
    • The low side A/C refrigerant line at the A/C compressor feels cool-to-warm.
    • The high side A/C refrigerant line at the A/C compressor feels warm-to-hot.
    Do the listed conditions exist? If so, go to step  5. If not, go to next step.
  4. Refer to the pressures recorded during the A/C SYSTEM PERFORMANCE TEST. Inspect for the following conditions:
    • The low side pressure is above the specified pressure range of the A/C Performance Table.
    • The high side pressure is below the specified pressure range of the A/C Performance Table.
    • The low side A/C refrigerant line at the A/C compressor feels warm.
    • The high side A/C refrigerant line at the A/C compressor feels warm to hot.
    Do the listed conditions exist? If so, go to next step. If not, go to A/C SYSTEM PERFORMANCE TEST  under PERFORMANCE TESTS.
  5. The A/C system has a low A/C refrigerant charge. Evacuate 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.
  6. Record the low and high side pressures as well as 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 step  13. If not, go to next step.
  7. The A/C compressor is malfunctioning. Remove the orifice tube and inspect for contamination. See ORIFICE TUBE  under REMOVAL & INSTALLATION. Are there metal flakes on the orifice tube? If so, go to step  9. If not, go to next step.
  8. Inspect the orifice tube for a brown, powdery residue indicating desiccant in the A/C system. Is there a brown, powdery residue present? If so, go to step  11. If not, go to step  12.
  9. Remove the A/C compressor hose from the A/C compressor. See COMPRESSOR HOSE  under REMOVAL & INSTALLATION. Inspect for metal flake contamination at the line connections and the A/C compressor ports. Is there metal flake contamination present? If so, go to next step. If not, go to step  12.
  10. Replace the A/C compressor. See COMPRESSOR  under REMOVAL & INSTALLATION. Install an A/C refrigerant filter. See REFRIGERANT FILTER  under REMOVAL & INSTALLATION. Replace the orifice tube. See ORIFICE TUBE  under REMOVAL & INSTALLATION. Evacuate 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  13.
  11. Flush the A/C system. See FLUSHING PROCEDURES in GENERAL SERVICING PROCEDURES article in GENERAL SERVICING. Replace the orifice tube. See ORIFICE TUBE  under REMOVAL & INSTALLATION. Replace the A/C compressor. See COMPRESSOR  under REMOVAL & INSTALLATION. Replace the accumulator. See ACCUMULATOR  under REMOVAL & INSTALLATION. Evacuate 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  13.
  12. Replace the A/C compressor. See COMPRESSOR  under REMOVAL & INSTALLATION. Evacuate 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  13.
  13. 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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