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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 (2 Of 3) >> Rear Air Conditioning Unit >> Disassembly [12/2019 - ] >> Procedure

Disassembly [12/2019 - ]: Procedure

  1. REMOVE DRAIN COOLER HOSE 
    1. Remove the drain cooler hose.
      GTY916179Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. REMOVE AIR DUCT PACKING 
    1. Remove the air duct packing.
      GTY916177Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. REMOVE AIR CONDITIONING HOSE AND ACCESSORY 
    1. Remove the 2 screws.
      GTY943376Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using pliers, grip the claws of the 2 clips and slide the clips to disconnect the air conditioning hose and accessory.
      GTY916135Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Remove the bolt and air conditioning hose and accessory.
      GTY916132Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Remove the 2 O-rings from the air conditioning hose and accessory.
      NOTE:

      Seal the openings of the disconnected parts using vinyl tape to prevent entry of moisture and foreign matter.

  4. REMOVE REAR COOLING UNIT EXPANSION VALVE 
    1. Disengage the 3 claws to remove the plate.
      GTY916130Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the grommet.
      GTY943365Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Using a 4 mm hexagon socket wrench, remove the 2 hexagon bolts and rear cooling unit expansion valve.
      GTY916127Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Remove the 2 O-rings from the rear evaporator sub-assembly.
      NOTE:

      Seal the openings of the disconnected parts using vinyl tape to prevent entry of moisture and foreign matter.

  5. REMOVE HEATER RADIATOR UNIT SUB-ASSEMBLY 
    1. Remove the 3 screws.
      GTY916126Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disengage the 2 guides and remove the bracket.
    3. Remove the screw and clamp.
      GTY916125Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Remove the 2 bushes.
      GTY943364Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Remove the heater radiator unit sub-assembly as shown in the illustration.
      GTY840616Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Remove in this Direction
      NOTE:

      Prepare a drain pan or cloth in case the coolant leaks.

  6. REMOVE REAR BLOWER MOTOR WITH FAN SUB-ASSEMBLY 
    1. Remove the 3 screws and rear blower motor with fan sub-assembly.
      GTY916120Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. REMOVE BLOWER MOTOR CONTROL 
    1. Remove the 2 screws and blower motor control.
      GTY916118Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. REMOVE REAR MODE DAMPER SERVO SUB-ASSEMBLY 
    1. Disconnect the connector.
      GTY916116Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the 2 screws and rear mode damper servo sub-assembly.
  9. REMOVE REAR AIR MIX DAMPER SERVO SUB-ASSEMBLY 
    1. Disconnect the connector.
      GTY916114Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the 2 screws and rear air mix damper servo sub-assembly.
  10. REMOVE NO. 2 AIR CONDITIONING HARNESS ASSEMBLY 
    1. Disengage each clamp and disconnect the No. 2 air conditioning harness assembly.
      GTY916112Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the 12 screws and rear cooling unit cover LH.
      GTY943361Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Disengage the 2 claws to remove the No. 2 air conditioning harness assembly.
      GTY916110Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. REMOVE REAR EVAPORATOR SUB-ASSEMBLY 
    1. Remove the rear evaporator sub-assembly as shown in the illustration.
      GTY839228Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Remove in this Direction
      NOTE:

      When the rear evaporator sub-assembly is removed, make sure to install a new one. The rear evaporator sub-assembly cannot be reused.

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