2003 LEXUS LS430 Expansion Valve

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

Fig. 49: Removing Heater Case Sub-Assy
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18.REMOVE COOLER EXPANSION VALVE
a. Using a hexagon wrench 5 mm (0.20 in.), remove the 2 hexagon bolts and air conditioning tube
assy.

Fig. 50: Removing Hexagon Bolts (1 Of 2)
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b. Remove the 2 O-rings from the air conditioning tube assy.
c. Using a hexagon wrench 5 mm (0.20 in.), remove the 2 hexagon bolts and cooler expansion valve.
d. Remove the 4 O-rin
gs from the cooler expansion valve.

Fig. 58: Removing Air Outlet Servomotor
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26.REMOVE WIRING AIR CONDITIONING HARNESS SUB-ASSY
27.INSTALL COOLER EXPANSION VALVE
a. Sufficiently apply compressor oil to 4 new O-rings and fitting surface of the cooler expansion
valve.
Compressor oil: ND-OIL 8 or equivalent
b. Install the 4 O-rings to the cooler expansion valve.
c. Using a hexagon wrench 5 mm (0.20 in.), install the cooler expansion valve with the 2 hexagon
bolts.
Torque: 4.1 N.m (42 kgf.cm, 36 ft.lbf)

Fig. 59: Installing Cooler Expansion Valve
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d. Sufficiently apply compressor oil to 2 new O-rings and fitting surface of the cooler expansion
valve.
Compressor oil: ND-OIL 8 or equivalent
e. Install the 2 O-rings to the cooler expansion valve.
f. Using a hexagon wrench 5 mm (0.20 in.), install the cooler expansion valve with the 2 hexagon
bolts.
Torque: 4.1 N.m (42 kgf.cm, 36 ft.lbf)

Fig. 103: Installing Discharge Hose Sub-Assy No. 1
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17.CONNECT NEGATIVE TERMINAL CABLE TO BATTERY
18.CHARGE REFRIGERANT (See REPLACEMENT
)
19.WARM UP ENGINE
20.INSPECT FOR REFRIGERANT LEAKAGE (See REPLACEMENT
)
ON-VEHICLE INSPECTION
1.INSPECT EXPANSION VALVE
a. Check quantity of gas during refrigeration cycle.
b. Set on manifold gauge set.
c. Run engine.
1. Run the engine at 1,500 rpm for at least 5 minutes.
2. Then check that the high pressure reading is 1.37 to 1.57 Mpa (14 to 16 kgf.cm
2 , 199 to 288
psi).

d. Check expansion valve.
If the expansion valve is faulty, the low pressure reading will drop to 0kPa (0 kgf cm
2 , 0 psi).
HINT:
When the lower pressure drop to 0kPa (0 kgf cm
2 , 0 psi), feel the receiver's IN and OUT sides for no
temperature difference.
COMPONENTS

Fig. 127: Removing Evaporator Sub-Assy (Rear)
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35.REMOVE REAR COOLING UNIT EXPANSION VALVE
a. Using a hexagon wrench 5 mm (0.20 in.), remove the 2 hexagon bolts, air conditioning tube assy
and rear cooling unit expansion valve.
b. Remove the 4 O-rings from the rear cooling unit expansion valve.