- Compressor with motor assembly malfunction
- Refrigerant volume (low)
- Cooler expansion valve (opened excessively)
- Damper servo malfunction
- Mechanical locking of damper and damper link
| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM1000000026Z4K |
| Model Year Start: 2023 | Model: Corolla | Prod Date Range: [09/2022 - ] |
| Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): Front Window Fogging; 2023 - 2025 MY Corolla Corolla HV [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 |
|
PROCEDURE
|
1. |
CHECK REFRIGERANT SHORTAGE |
(a) Prepare the vehicle according to the table below.
Measurement Condition:
|
Item |
Condition |
|---|---|
|
A/C Switch |
On |
|
Ambient Temperature*1 |
0 to 49°C (32 to 120°F) |
|
Air Conditioning Air Inlet Temperature*2 |
25 to 35°C (77 to 95°F) |
|
Set Temperature |
MAX COLD |
|
Recirculation/fresh Control Switch |
Recirculation |
|
Air Vent Damper Position |
FACE |
|
Blower Speed |
HI |
HINT:
*1: This inspection can be judged correctly only if the ambient temperature is within a range of 0 to 49°C (32 to 120°F). Therefore, postpone the test if the temperature is low.
*2: This inspection can be judged correctly only if the air inlet temperature is within a range of 25 to 35°C (77 to 95°F). Therefore, postpone the test if the temperature is out of range.
(b) Using the GTS, check the amount of refrigerant.
Body Electrical > Air Conditioner > Utility
|
Tester Display |
|---|
|
Refrigerant Gas Volume Check |
NOTICE:
If the conditions for the inspection are not met, "Refrigerant incorrect" will be displayed on the GTS. Confirm the conditions of the inspection and perform the check again.
HINT:
- If the amount of refrigerant is insufficient, "Refrigerant shortage" is displayed on the GTS and the indicator light on the A/C switch turns off.
- When performing this inspection, a DTC will not be output even if "Refrigerant shortage" is displayed on the GTS.
|
Result |
Amount of Refrigerant |
|---|---|
|
Refrigerant shortage |
Insufficient or leakage |
|
Refrigerant correct |
Correct |
|
Refrigerant incorrect |
Incorrect |
OK:
"Refrigerant correct" is displayed on the GTS.
| NG |
|
CHARGE SYSTEM WITH REFRIGERANT for HFC-134a(R134a): Click here
for HFO-1234yf(R1234yf): Click here
|
![2020 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - ]; HEATING / AIR CONDITIONING: REFRIGERANT (for HFC-134a(R134a)): REPLACEMENT](/t3Portal/stylegraphics/info.gif)
|
|
2. |
CHECK OPERATION |
(a) Check that the air conditioning system changes to DEF mode according to the switch operation, when the MODE switch on the air conditioning control assembly is pushed.
OK:
Air conditioning system changes to DEF mode.
| OK |
|
INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET for HFC-134a(R134a): Click here
for HFO-1234yf(R1234yf): Click here
|
| NG |
|
|
|