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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating / Air Conditioning System - Service Information (1 Of 3) >> FRONT AIR CONDITIONING UNIT (for Gasoline Model) >> Disassembly [11/2023 - ] >> Procedure

Disassembly [11/2023 - ]: Procedure

  1. REMOVE NO. 3 AIR DUCT SUB-ASSEMBLY 

    See step  1

  2. REMOVE GROMMET (for Manual Air Conditioning System) 
    1. Disengage the 2 claws to remove the grommet.
      GTY918654Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. REMOVE ASPIRATOR (for Automatic Air Conditioning System) 

    See step  2

  4. REMOVE BLOWER ASSEMBLY 

    Refer to PROCEDURE - Step 3

  5. REMOVE AIR CONDITIONING AMPLIFIER ASSEMBLY 

    See step  4

  6. REMOVE AIR CONDITIONING HARNESS ASSEMBLY 
    1. Disconnect each connector.
      GTY1121984Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disengage each clamp to remove the air conditioning harness assembly.
  7. REMOVE HEATER COVER 

    See step  6

  8. REMOVE DRAIN COOLER HOSE 

    See step  7

  9. REMOVE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY 
    1. for Single Type:
      1. Remove the 3 screws and No. 1 air conditioning radiator damper servo sub-assembly.
        GTY918589Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. for Dual Type:
      1. Remove the 3 screws and No. 1 air conditioning radiator damper servo sub-assembly.
        GTY918584Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. REMOVE NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (for Automatic Air Conditioning System) 

    See step  9

  11. REMOVE HEATER GROMMET 

    See step  10

  12. REMOVE HEATER CLAMP 

    See step  11

  13. REMOVE HEATER RADIATOR UNIT SUB-ASSEMBLY 

    See step  12

  14. REMOVE COOLING UNIT PARTS 

    See step  13

  15. REMOVE COOLER EXPANSION VALVE 

    See step  14

  16. REMOVE NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY 
    1. Remove the 2 screws.
      GTY918625Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disengage the 10 claws to remove the upper heater case with No. 1 cooler evaporator sub-assembly from the lower heater case.
    3. w/o Stop And Start System:
      1. Disengage the 2 clamps.
        GTY918623Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Remove the No. 1 cooler evaporator sub-assembly with No. 1 cooler thermistor from the upper heater case.
        NOTE:

        When the No. 1 cooler evaporator sub-assembly is removed, make sure to install a new one. The No. 1 cooler evaporator sub-assembly cannot be reused.

    4. w/ Stop And Start System:
      1. Disengage the 2 clamps.
        GTY918622Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Remove the No. 1 cooler evaporator sub-assembly with No. 1 cooler thermistor from the upper heater case.
        NOTE:

        When the No. 1 cooler evaporator sub-assembly is removed, make sure to install a new one. The No. 1 cooler evaporator sub-assembly cannot be reused.

  17. REMOVE NO. 1 COOLER THERMISTOR 

    Refer to PROCEDURE - Step 10

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