Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Disassembly

DISASSEMBLY

PROCEDURE

1. PRECAUTION

NOTICE:

Make sure to perform initialization after replacing the air conditioning radiator damper servo sub-assembly. If initialization is not performed, the air conditioner unit assembly will not perform properly as the air conditioning amplifier assembly will not be able to recognize the position of the air conditioning radiator damper sub-assembly.

2. REMOVE NO. 5 AIR DUCT SUB-ASSEMBLY

(a) Remove the screw.

(b) Disengage the 3 claws to remove the No. 5 air duct sub-assembly.

3. REMOVE ASPIRATOR

(a) Disengage the 2 claws to remove the aspirator.

4. REMOVE ID CODE BOX (IMMOBILISER CODE ECU)

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5. REMOVE BLOWER ASSEMBLY

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6. REMOVE NO. 2 HEATER COVER

(a) Remove the screw.

(b) Disengage the claw and guide to remove the No. 2 heater cover.

7. REMOVE HEATER COVER (w/o PTC Heater)

(a) Disengage the guide and remove the heater cover as shown in the illustration.

Remove in this Direction

8. REMOVE QUICK HEATER ASSEMBLY (w/ PTC Heater)

(a) Disengage the guide and remove the quick heater assembly as shown in the illustration.

Remove in this Direction

9. REMOVE AIR CONDITIONING HARNESS ASSEMBLY

(a) Disconnect each connector.

(b) Disengage each clamp to remove the air conditioning harness assembly.

10. REMOVE DRAIN COOLER HOSE

(a) Remove the drain cooler hose.

11. REMOVE AIR CONDITIONING AMPLIFIER ASSEMBLY

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12. REMOVE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

(a) Remove the 3 screws and No. 1 air conditioning radiator damper servo sub-assembly.

13. REMOVE NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

(a) Remove the 2 screws and No. 3 air conditioning radiator damper servo sub-assembly.

14. REMOVE NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY

(a) Remove the 2 screws and No. 2 air conditioning radiator damper servo sub-assembly.

15. REMOVE HEATER GROMMET

(a) Remove the heater grommet.

16. REMOVE HEATER RADIATOR UNIT SUB-ASSEMBLY

(a) Disengage the 4 claws to remove the heater clamp.

Remove in this Direction

(b) Remove the heater radiator unit sub-assembly as shown in the illustration.

NOTICE:

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

17. REMOVE COOLING UNIT PARTS

(a) Remove the cooling unit parts.

18. REMOVE COOLER EXPANSION VALVE

(a) Using a 4 mm hexagon socket wrench, remove the 2 hexagon bolts and cooler expansion valve.

(b) Remove the 2 O-rings from the No. 1 cooler evaporator sub-assembly.

19. REMOVE NO. 1 COOLER EVAPORATOR SUB-ASSEMBLY

(a) Remove the 2 screws.

(b) Disengage the 10 claws to remove the upper heater case with No. 1 cooler evaporator sub-assembly from the lower heater case.

(c) Disengage the 2 clamps.

(d) Remove the No. 1 cooler evaporator sub-assembly with No. 1 cooler thermistor from the upper heater case.

NOTICE:

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.

20. REMOVE NO. 1 COOLER THERMISTOR

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