HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Manual Air Conditioning System): Front Window Fogging; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019

Last Modified: 05-13-2024	6.11:8.1.0	Doc ID: RM100000001H96J
Model Year Start: 2020	Model: GR Corolla	Prod Date Range: [01/2019 - 09/2022]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Gasoline Model with Manual Air Conditioning System): Front Window Fogging; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]

Front Window Fogging

DESCRIPTION

If the windshield frequently fogs up even though the air conditioning system is operating, the following factors may be the cause.

Symptom	Factor
Windshield frequently fogs up	Compressor assembly with pulley malfunction Refrigerant volume (low) Cooler expansion valve (opened excessively) No. 1 air conditioning radiator damper servo sub-assembly malfunction Mechanical locking of damper and damper link

1.	PERFORM REFRIGERANT SHORTAGE CHECK

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Air Conditioner / Utility / Refrigerant Gas Volume Check.

Tester Display
Refrigerant Gas Volume Check

(e) Check that the following conditions are met and perform the refrigerant shortage check according to the display on the Techstream.

*: If the ambient temperature is not within the range shown, do not perform this check.

Result	Amount of Refrigerant
Refrigerant correct	Correct
Refrigerant shortage	Insufficient

OK:

"Refrigerant correct" is displayed on the Techstream.

CHARGE SYSTEM WITH REFRIGERANT

2.	CHECK OPERATION

(a) Press the front defroster switch on the air conditioning control assembly and check that the air outlet mode changes to DEF mode.

OK:

The air outlet mode changes to DEF mode.