Toyota Lexusc Owner's Handbook Manual page 303

AIR CONDITIONING
If the engine coolant temperature becomes extremely high, the
air conditioning may shut off automatically to resolve
emergency situation for engine cooling.
malfunction. When the engine coolant temperature is lowered,
the air conditioning comes on automatically.
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(b) Windshield defogging and defrosting
This is not a
To remove interior fog on the windshield —
Push the windshield air flow button.
To remove frost or exterior fog on the windshield —
1. Push the "TEMP" button to set the maximum temperature.
2. Push the windshield air flow button.
3. Push the fan speed control button on the right side to obtain
a maximum air flow.
4. Leave the "A/C" button off.
When the windshield air flow button is pushed, air flows mainly
from the windshield vents and turns on the defogging function
with the purpose of clearing the front view.
Pushing this button once again returns the air flow mode to the
last one used.