Lexus IS250 · Service Manual HEATER & AIR CONDITIONING SYSTEM

REASSEMBLY

Removal / installation


1. INSTALL COOLER EVAPORATOR SUB-ASSEMBLY

  1. Sufficiently apply compressor oil to 2 new O-rings and the fitting surface of the cooler evaporator sub-assembly.

    Compressor oil:
    ND-OIL 8 or equivalent

  1. E107636
    Install the 2 O-rings on the cooler evaporator sub-assembly.

  1. E119812
    Install the air duct with the 3 claws and 5 screws.


2. INSTALL HEATER RADIATOR UNIT SUB-ASSEMBLY

  1. E125186
    Install the heater radiator unit sub-assembly.

  1. Install the clamp with the screw.


3. INSTALL AIR OUTLET CONTROL SERVO MOTOR

  1. E119810
    Install the air outlet control servo motor with the 2 screws.

  1. E107658E02
    Temporarily install the drive gear to the air outlet control servomotor. Check that the drive gear and the driven gear are engaged at point with the same number of gear teeth from the standard position. Install the drive gear to the air outlet control servomotor.

    NOTICE:
    1. If there is not the same number of gear teeth from the standard position on each gear at the point where the two gears are engaged, remove the drive gear, adjust the driven gear, and reinstall the drive gear.
    2. The number of gear teeth from the standard position varies according to the stop position of the air outlet control servomotor. Make sure that the gears are engaged at a point with the same number of gear teeth from the standard position.
    3. If there is not the same number of gear teeth from the standard position on each gear at the point where the two gears are engaged, the air outlet control servo motor may not operate normally.


4. INSTALL AIR MIX CONTROL SERVO MOTOR

  1. E119811
    Install the air mix control servo motor with the 2 screws.

  1. Install the drive gear to the air mix control servo motor.

  1. Temporarily install the mode damper servo assembly so that the levers fit into each groove.

  1. Slightly lift the air outlet control servo motor. Check that the drive gear and the driven gear are engaged at a point with the same number of gear teeth from the standard position from the view indicated by arrow (A).

    E125239E01

    NOTICE:
    1. If there is not the same number of gear teeth from the standard position on each gear at the point where the two gears are engaged, lift the air outlet control servo motor to adjust the driven gear and reinstall the air outlet control servo motor.
    2. If there is not the same number of gear teeth from the standard position on each gear at the point where the two gears are engaged, the air outlet control servo motor may not operate normally.

  1. Install the air outlet control servo motor with the 4 screws.


5. INSTALL AIR CONDITIONING HARNESS ASSEMBLY

  1. E119813
    Attach the 4 clamps to install the air conditioning harness assembly.

  1. Install the air conditioning harness as shown in the illustration.

  1. E119814E01
    Connect the 2 connectors and attach the clamp.


6. INSTALL COOLER EXPANSION VALVE

  1. E107633
    Install the expansion valve.

  1. Sufficiently apply compressor oil to 2 new O-rings and the fitting surface of the air conditioning tube assembly.

    Compressor oil:
    ND-OIL 8 or equivalent

  1. Install the 2 O-rings on the air conditioning tube assembly.

  1. Using a hexagon wrench 4 mm, install the air conditioning tube assembly with the 2 hexagon bolts.

    Torque:
    3.5 N*m{ 35 kgf*cm , 30 in.*lbf }

  1. E107632
    Install a new packing.


7. INSTALL AIR MIX CONTROL SERVO MOTOR

  1. Check that the drive gear and the driven gear are engaged at a point with the same number of gear teeth from the standard position. Temporarily install the air mix control servo motor.

    NOTICE:
    1. If there is not the same number of gear teeth from the standard position on each gear at the point where the two gears are engaged, remove the air mix control servo motor to adjust the driven gear and reinstall the air mix control servo motor.
    2. The number of gear teeth from the standard position varies according to the stop position of the air mix control servo motor. Make sure that the gears are engaged at a point with the same number of gear teeth from the standard position.
    3. If there is not the same number of gear teeth from the standard position on each gear at the point where the two gears are engaged, the air mix control servo motor may not operate normally.

  1. Install the air mix control servo motor with the 3 screws.


8. INSTALL AIR OUTLET CONTROL SERVO MOTOR

  1. E107625
    Install the air outlet control servo motor with the 3 screws.

  1. Connect the connector.

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