On-Vehicle Inspection: Notes

WARNING: This page is about a different car, the 2004 Lexus ES 330, 2003 Lexus ES 300, and 2002 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT REFRIGERANT VOLUME
1. Observe the sight glass on the cooler refrigerant liquid pipe A.
  Test conditions:
  - Running engine at 1,500 rpm
  - Blower speed control switch at "HI"
  - A/C switch ON
  - Temperature control dial at "MAX.COOL"
  - Fully open the doors
    
    Fig 1: Observing Sight Glass On Cooler Refrigerant Liquid Pipe A
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    Fig 2: Refrigerant Volume Symptom Chart
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INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET
1. This is a method in witch the trouble is located by using a manifold gauge set. Read the manifold gauge pressure when the these conditions are established. Test conditions:
  - Temperature at the air inlet with the switch set at RECIRC is 30 - 35 °C (86 - 95 °F)
  - Engine running at 1,500 rpm
  - Blower speed control switch at "HI" position
  - Temperature control dial at "COOL" position
  - A/C switch ON
  - Fully open doors
  1. Normally functioning refrigeration system.
    Gauge reading:
    - Low pressure side: 0.15 - 0.25 MPa (1.5 - 2.5 kgf/cm ² )
    - High pressure side: 1.37 - 1.57 MPa (14-16 kgf/cm ² )
    Fig 3: Inspecting Refrigerant Pressure With Manifold Gauge Set
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  2. Moisture present in refrigeration system.
    
    Fig 4: Moisture Present In Refrigeration System
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    Fig 5: Moisture Present In Refrigeration System Symptom Chart
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  3. Insufficient cooling
    
    Fig 6: Insufficient Cooling In Refrigeration System
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    Fig 7: Insufficient Cooling Symptom Chart
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  4. Poor circulation of refrigerant
    
    Fig 8: Poor Circulation Of Refrigerant
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    Fig 9: Poor Circulation Of Refrigerant Symptom Chart
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  5. Refrigerant does not circulate
    
    Fig 10: Refrigerant Does Not Circulate
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    Fig 11: Refrigerant Does Not Circulate Symptom Chart
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  6. Refrigerant overcharged or insufficient cooling of condenser
    
    Fig 12: Refrigerant Overcharged Or Insufficient Cooling Of Condenser
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    Fig 13: Refrigerant Overcharged Or Insufficient Cooling Of Condenser Symptom Chart
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  7. Air present in refrigeration system
    
    Fig 14: Air Present In Refrigerant System
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    Fig 15: Air Present In Refrigerant System Symptom Chart
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  8. Expansion valve improperly
    
    Fig 16: Expansion Valve Improperly
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    Fig 17: Expansion Valve Improperly Symptom Chart
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  9. Defective compression compressor
    
    Fig 18: Defective Compression Compressor
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    Fig 19: Defective Compression Compressor Symptom Chart
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002