On-Vehicle Inspection: Notes

INSPECT REFRIGERANT VOLUME
1. Observe the sight glass on the liquid tube.
  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: Identifying Sight Glass On Liquid Tube
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  Fig 2: Symptoms 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 1500 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: Identifying Refrigerant Pressure Manifold Gauge Set
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Moisture present in refrigeration system.
  
  Fig 4: Identifying Pressure Gauge Moisture Present In Refrigeration System
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 5: Symptoms Diagnosis Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Insufficient cooling
  
  Fig 6: Identifying Pressure Gauge Insufficient Cooling
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 7: Insufficient Cooling Symptoms Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Poor circulation of refrigerant
  
  Fig 8: Identifying Pressure Gauge Poor Circulation Of Refrigerant
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 9: Poor Circulation Of Refrigerant Symptoms Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Refrigerant does not circulate
  
  Fig 10: Identifying Pressure Gauge Refrigerant Does Not Circulate
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 11: Refrigerant Does Not Circulate Symptoms Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Refrigerant overcharged or insufficient cooling of condenser
  
  Fig 12: Identifying Pressure Gauge Refrigerant Overcharged Or Insufficient Cooling Of Condenser
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 13: Refrigerant Overcharged Or Insufficient Cooling Of Condenser Symptoms Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Air present in refrigeration system
  
  Fig 14: Identifying Pressure Gauge Air Present In Refrigeration System
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 15: Air Present In Refrigeration System Symptoms Chart
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8. Expansion valve improperly
  
  Fig 16: Identifying Gauge Expansion Valve Improperly
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 17: Expansion Valve Improperly Symptoms Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
9. Defective compression compressor
  
  Fig 18: Identifying Gauge Defective Compression Compressor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 19: Defective Compression Compressor Symptoms Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002