LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (HVAC Systems - Manual) >> System Tests >> A/C Pressure Zone "C" Diagnosis

A/C Pressure Zone "C" Diagnosis

WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. 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  .
  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  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 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 ELECTRIC COOLING FANS article in ENGINE COOLING. 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  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.
scientia non olet · About LEMON Manuals