LEXUS LS430 2003 Factory Repair Manual

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 )

Fig. 8: Identifying Normally Functioning Refrigeration System
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
2. Moisture present in refri
geration system

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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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

Fig. 15: Identifying Refrigerant Does Not Circulate
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Fig. 16: Refrigerant Pressure With Manifold Gauge Set Chart (Refrigerant Does Not
Circulate)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
6. Refri
gerant is overcharged or cooling effectiveness of condenser is insufficient

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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Fig. 20: Refrigerant Pressure With Manifold Gauge Set Charge Chart (Air Present In
Refrigeration System)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
8. Expansion valve malfunction
Fig. 21: Identifying Expansion Valve Malfunction

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig. 22: Refrigerant Pressure With Manifold Gauge Set Charge Chart (Expansion Valve
Malfunction)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
9. Defective compression compressor

Fig. 23: Identifying Defective Compression Compressor
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
<0029004c004a0011000300150017001d00030035004800490055004c004a004800550044005100570003003300550048005600560058005500480003003a004c0057004b0003003000440051004c00490052004f00470003002a00440058004a0048000300
360048005700030026004b00440055004a004800030026004b[art (Defective
Compression Compressor)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Gauge reading (Reference)

Fig. 25: Identifying Gauge Reading Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
REPLACEMENT
1.DISCHARGE REFRIGERANT FROM REFRIGERATION SYSTEM
a. Turn the A/C switch on.
b. Operate the cooler compressor at an engine rpm of approximately 1,000 for 5 to 6 minutes to
circulate the refrigerant and collect as much compressor oil remaining in each component into the
cooler compressor as possible.
c. Stop the engine.
d. Using SST, discharge refrigerant gas.
<00360036003700030013001a00140014001300100018001b0013001900130003000b0013001a00140014001a00100018001b0013001b0013000f00030013001a00140014001a00100018001b0013001c0013000f00030013001a00140014001a0010001a00
1b001300180013000f00030013001a00140014001a0010001b[8060, 07117-88070,
07117-88080)
2.CHARGE REFRIGERANT
a. Using a vacuum pump, perform vacuum purging.
b. Using SST, charge refrigerant HFC-134a (R134a).
Standard:
Single A/C: 650 +/- 50 g (22.93 +/- 1.76 oz.)
Dual A/C: 900 +/- 50 g (31.74 +/- 1.76 oz.)
<00360036003700030013001a00140014001300100018001b0013001900130003000b0013001a00140014001a00100018001b001300190013000f00030013001a00140014001a00100018001b0013001a0013000f00030013001a00140014001a0010001800
1b0013001b0013000f00030013001a00140014001a00100018[8090, 07117-78050,
07117-88060, 07117-88070, 07117-88080)

Fig. 26: Height Pressure To Refrigerant Amount Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3.WARM UP ENGINE
4.INSPECT FOR REFRIGERANT LEAKAGE
a. Perform in these conditions:
Stop the engine.
Secure good ventilation (the gas leak detector may not react to volatile gases which are not
refrigerant, such as evaporated gasoline and exhaust gas).
Repeat the test 2 or 3 times.
Make sure that there is some refrigerant remaining in the refrigeration system.
When compressor is off: approx. 392 to 588 kPa (4 to 6 kgf/cm
2 , 57 to 85 psi)
b. Bring the gas leak detector close to the drain hose before performing the test.