Page 4201 of 4500
2.INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET
a. This is a method in which 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 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 )
Page 4202 of 4500
Fig. 8: Identifying Normally Functioning Refrigeration System
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2. Moisture present in refri
geration system
Page 4203 of 4500
Fig. 9: Identifying Moisture Present In Refrigeration System
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig. 10: Refrigerant Pressure With Manifold Gauge Set Chart (Moisture Present)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3. Insufficient cooling
Fig. 11: Identifying Insufficient Cooling
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Page 4204 of 4500
Fig. 12: Refrigerant Pressure With Manifold Gauge Set Chart (Insufficient Cooling)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
4. Poor circulation of refrigerant
Fig. 13: Identifying Poor Circulation Of Refrigerant
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Fig. 14: Refrigerant Pressure With Manifold Gauge Set Chart (Poor Circulation Of
Refrigerant)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
5. Refri
gerant does not circulate
Page 4205 of 4500
Fig. 15: Identifying Refrigerant Does Not Circulate
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Fig. 16: Refrigerant Pressure With Manifold Gauge Set Chart (Refrigerant Does Not
Circulate)
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6. Refri
gerant is overcharged or cooling effectiveness of condenser is insufficient
Page 4206 of 4500
Fig. 17: Identifying Refrigerant Is Overcharged Or Cooling Effectiveness Of Condenser Is
Insufficient
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Fig. 18: Refrigerant Pressure With Manifold Gauge Set Charge Chart (Refrigerant
Overcharged Or Cooling Effectiveness Of Condenser Is Insufficient)
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7. Air present in refrigeration system
Fig. 19: Identifying Air Present In Refrigeration System
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Page 4207 of 4500
Fig. 20: Refrigerant Pressure With Manifold Gauge Set Charge Chart (Air Present In
Refrigeration System)
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8. Expansion valve malfunction
Fig. 21: Identifying Expansion Valve Malfunction
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Fig. 22: Refrigerant Pressure With Manifold Gauge Set Charge Chart (Expansion Valve
Malfunction)
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9. Defective compression compressor
Page 4208 of 4500
Fig. 23: Identifying Defective Compression Compressor
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<0029004c004a0011000300150017001d00030035004800490055004c004a004800550044005100570003003300550048005600560058005500480003003a004c0057004b0003003000440051004c00490052004f00470003002a00440058004a0048000300
360048005700030026004b00440055004a004800030026004b[art (Defective
Compression Compressor)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Gauge reading (Reference)