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) ·
Damper servo malfunction ·
Mechanical locking of damper and damper link |
Prepare the vehicle according to the table below.
| 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 |
*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.
Using the GTS, check the amount of refrigerant.
| Tester Display |
|---|
| Refrigerant Gas Volume Check |
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.
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 |
"Refrigerant correct" is displayed on the GTS.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
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.
Air conditioning system changes to DEF mode.
| Proceed to |
|---|
| OK |
| NG |
OK
NG