On-Vehicle Inspection: Notes

1. Check the sight glass on the liquid tube.

   Test conditions:

• Engine is running at 1,500 RPM
• Single A/C:

  Blower speed control switch at "HI" position

• Dual A/C:

  Front blower switch at "HI" position

  Rear blower switch at "HI" position

• A/C switch ON
• Single A/C:

  Temperature control switch at "MAX. COOL" position

• Dual A/C:

  Rear temperature control switch at "MAX.COOL" position

  Front driver side temperature control switch at "MAX.COOL" position

  Front passenger side temperature control switch at "MAX.COOL" position

• Fully open the doors
  Fig 1: Locating Sight Glass

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  Fig 2: Diagnostic Chart

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1. This is a method in which trouble is located by using manifold gauge set. Read the manifold gauge pressure when these conditions are established.

   Test conditions:

• Temperature at the air inlet with the switch set at RECIRC is 30 to 35°C (86 to 95°F)
• Engine is running at 2,000 RPM
• Blower speed control switch is at "HI"
• Temperature control dial is at "COOL"

HINT:

It should be noted that the gauge indications may vary slightly due to ambient temperature conditions.

1. Normally functioning refrigeration system

   Gauge reading: 

   Low pressure side: 

   0.15 to 0.25 MPa (1.5 to 2.5 kgf/cm ²  ) 

   High pressure side: 

   1.37 to 1.57 MPa (14 to 16 kgf/cm ²  ) 

   Fig 3: Identifying Manifold Gauge Set

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2. Moisture present in refrigeration system
   Fig 4: Identifying Manifold Gauge Set - Moisture Present In Refrigeration System

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   Fig 5: Diagnostic Chart

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3. Insufficient cooling
   Fig 6: Identifying Manifold Gauge Set - Insufficient Cooling

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   Fig 7: Diagnostic Chart

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4. Poor circulation of refrigerant
   Fig 8: Identifying Manifold Gauge Set - Poor Circulation Of Refrigerant

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   Fig 9: Diagnostic Chart

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5. Refrigerant does not circulate
   Fig 10: Identifying Manifold Gauge Set - Refrigerant Does Not Circulate

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   Fig 11: Diagnostic Chart

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6. Refrigerant is overcharged or cooling effectiveness of condenser is insufficient
   Fig 12: Identifying Manifold Gauge Set - Refrigerant Is Overcharged Or Cooling Effectiveness Of Condenser Is Insufficient

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   Fig 13: Diagnostic Chart

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7. Air present in refrigeration system
   Fig 14: Identifying Manifold Gauge Set - Air Present In Refrigeration System

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   Fig 15: Diagnostic Chart

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8. Expansion valve malfunction
   Fig 16: Identifying Manifold Gauge Set - Expansion Valve Malfunction

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   Fig 17: Diagnostic Chart

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9. Defective compression compressor
   Fig 18: Identifying Manifold Gauge Set - Defective Compression Compressor

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   Fig 19: Diagnostic Chart

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