Toyota Yaris: Air Conditioning System / Front Window Fogging

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System / 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 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

PROCEDURE

1.	PERFORM REFRIGERANT SHORTAGE CHECK

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

Measurement Condition:

Item	Condition
A/C switch	On
Ambient temperature*1	0 to 49°C (32 to 120°F)
Blower speed	HI

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

Body Electrical > Air Conditioner > Utility

Tester Display
Refrigerant Gas Volume Check

Result	Amount of Refrigerant
Refrigerant correct	Correct
Refrigerant shortage	Insufficient

OK:

"Refrigerant correct" is displayed on the GTS.

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.

INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET

GO TO DTC B14037F

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