On-Vehicle Inspection

Fig 1: Locating Sight Glass

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Observe the sight glass on the liquid tube. Test conditions:

• Running engine at 1,500 RPM
• Front A/C:
  1. Blower speed control switch at "HI" position
• Dual A/C:
  1. Rear blower switch at "HI" position
• A/C switch ON
• Front A/C:
  1. Temperature control switch at "MAX. COOL" position
• Dual A/C:
  1. Rear temperature control switch at "MAX. COOL" position
• Fully open the doors

Fig 2: Problem Symptoms & Remedy Chart

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This is a method in which the trouble is located by using a 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 30-35 °C (86-95 °F)
• Engine running at 2,000 RPM
• Blower speed control switch at "HI" position
• Temperature control dial on "COOL" position

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: 

   1. 0.15-0.25 MPa (1.5-2.5 kgf/cm ²  ) 

   High Pressure Side: 

   1. 1.37-1.55 MPa (14-15 kgf/cm ²  ) 
   Fig 3: Identifying Manifold Gauge Set Reading For Normally Functioning Refrigerant System

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Moisture present in refrigeration system.
   Fig 4: Manifold Gauge Readings When Moisture Present In Refrigeration System

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002