A/C System General Diagnostic Procedures

• Description
• Preparation For Testing
• Air Conditioning System Performance Check
• Ambient Temperature/Pressure
• Evaporator Temperature/Pressure
• A/C Diagnosis W/Gauges For SYS. W/Insufficient Or No Cooling
• Air Conditioning General Trouble Shooting
  • Condition & Possible Cause
    • Compressor Not Working
    • Excessive Noise or Vibration
    • Insufficient or No Cooling; Compressor Working
• Heater General Trouble Shooting
  • Condition & Possible Cause
    • Insufficient, Erratic, or No Heat
    • Too Much Heat
    • Airflow Changes During Acceleration
    • Air From Defroster At All Times
    • Blower Does Not Operate Correctly