heater LEXUS LS430 2003 Factory Manual PDF

Fig. 37: Removing Heater Control Housing
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
11.REMOVE HEATER CONTROL BULB
a. Usin
g a screwdriver, turn the bulbs to the left and pull out the bulbs.

Fig. 38: Removing Heater Control Bulb
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
12.REMOVE HEATER CONTROL BASE SUB-ASSY
a. Release the 4 claws and remove the heater control base.

Fig. 39: Removing Heater Control Base Sub-Assy
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
13.REMOVE AIR CONDITIONER PANEL SUB-ASSY
COMPONENTS

INSPECTION
1.CHECK EVAPORATOR AND HEATER RADIATOR FINS FOR FOREIGN MATTER
If foreign matter is attached to the fin, blow it off with compressed air.
2.CHECK FITTINGS FOR CRACKS OR SCRATCHES
a. Repair as necessary.
3.INSPECT EVAPORATOR TEMPERATURE SENSOR CIRCUIT (See DTC B1413:
EVAPORATOR TEMPERATURE SENSOR CIRCUIT )
4.INSPECT COOL AIR BYPASS DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE) (See
DTC B1434: MAX COOL DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE)
)
5.INSPECT COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER
SIDE) (See COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER
SIDE) )
6.INSPECT COOL AIR BYPASS DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE)
(See COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER
SIDE) )
7.INSPECT COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (PASSENGER
SIDE) (SEE COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT
(PASSENGER SIDE) )
8.INSPECT WATER VALVE CONTROL SERVOMOTOR CIRCUIT (See WATER VALVE
CONTROL SERVOMOTOR CIRCUIT )
9.INSPECT AIR VENT MODE DAMPER CONTROL SERVOMOTOR CIRCUIT (See AIR VENT
MODE DAMPER CONTROL SERVOMOTOR CIRCUIT )
10.INSPECT AIR MIX DAMPER CONTROL SERVOMOTOR CIRCUIT (See AIR MIX DAMPER
CONTROL SERVOMOTOR CIRCUIT )
OVERHAUL
HINT:
Installation is in the reverse order of removal.
See COMPONENTS .
1.DISCONNECT NEGATIVE TERMINAL CABLE FROM BATTERY
2.EVACUATE REFRIGERANT HFC-134A (R134A) (See REPLACEMENT
)
3.DRAIN ENGINE COOLANT FROM RADIATOR
HINT:
It is not necessar
y to drain out all coolant.

7.DISCONNECT HEATER WATER OUTLET HOSE A (FROM HEATER UNIT)
a. Grip the claws of the hose clip and slide the hose clip along the hose.
b. Disconnect heater water outlet hose A.
Fig. 43: Disconnecting Heater Water Outlet Hose A (From Heater Unit)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
8.DISCONNECT HEATER WATER INLET HOSE B
a. Disconnect heater water inlet hose B.
9.DISCONNECT WATER VALVE CONTROL CABLE
10.REMOVE INSTRUMENT PANEL SAFETY PAD SUB-ASSY (See step 19 in REPLACEMENT
)
11.REMOVE BLOWER ASSY (See OVERHAUL
)
12.REMOVE SEAT (See OVERHAUL
)
13.SEPARATE AIR DUCT REAR NO. 1
a. Remove the 2 screws, bolt and center air duct.

Fig. 46: Removing Air Conditioning Radiator Assy
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
17.REMOVE HEATER CASE SUB-ASSY
a. Remove the 5 screws, release the 2 claws and remove the air vent duct.

Fig. 48: Removing Heater Case Sub-Assy Screws
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Usin
g a screwdriver, release the 2 claws and remove the heater case sub-assy.

Fig. 49: Removing Heater Case Sub-Assy
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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. 52: Removing Evaporator Cover
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
20.REMOVE EVAPORATOR TEMPERATURE SENSOR
21.REMOVE HEATER RADIATOR UNIT SUB-ASSY
a. Remove the screw and clamp.
b. Remove the 2 screws, 2 clamps and heater radiator pipes.
c. Remove the 2 O-rings from the heater radiator pipes.
d. Pull out the heater radiator unit sub-assy.

Fig. 53: Removing Heater Radiator Unit Sub-Assy
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
22.REMOVE WATER VALVE CONTROL SERVOMOTOR
a. Disconnect the connector.
b. Disconnect the control cable.
c. Remove the 2 screws and water valve control servomotor.