DISASSEMBLY PROCEDURE 1. REMOVE NO. 4 HEATER TO REGISTER DUCT SUB-ASSEMBLY Click here 2. REMOVE NO. 2 AIR DUCT SUB-ASSEMBLY Click here 3. REMOVE NO. 2 AIR DUCT Click here 4. REMOVE ASPIRATOR Click here 5. REMOVE BLOWER ASSEMBLY Click here 6. REMOVE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here 7. REMOVE AIR CONDITIONING HARNESS ASSEMBLY
(b) Disengage each clamp to remove the air conditioning harness assembly. 8. REMOVE HEATER COVER (a) Remove the screw. 
(b) Remove the heater cover as shown in the illustration. 9. REMOVE DRAIN COOLER HOSE Click here 10. REMOVE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here
11. REMOVE NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here 12. REMOVE HEATER PIPE GROMMET Click here 13. REMOVE HEATER CLAMP Click here 14. REMOVE HEATER RADIATOR UNIT SUB-ASSEMBLY Click here 15. REMOVE COOLING UNIT PARTS Click here 16. REMOVE COOLER EXPANSION VALVE Click here 17. 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.
(d) Remove the No. 1 cooler evaporator sub-assembly with No. 1 cooler thermistor from the upper heater case. 18. REMOVE NO. 1 COOLER THERMISTOR Click here
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Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Sfi System: Engine Coolant Bypass Valve Circuit Short to Ground (P268111,P268115)
DESCRIPTION The flow shutting valve (for heater control) used for the variable cooling system is a magnet type valve that is closed when the engine is warming up to prevent coolant from flowing through the heater passage which reduces engine warm up time. DTC No. Detection Item DTC Detection Conditi ...
