TOYOTA 2010 Corolla - Manual (Page 201)

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3-1. Using the air conditioning system and defogger
CAUTION
■ To prevent the windshield from fogging up
Do not use during cool air operation in extremely humid weather.
The difference between the temperature of the outside air and that of the
windshield can cause the outer surface of the windshield to fog up, blocking
your vision.
NOTICE
■ To prevent battery discharge
Do not leave the automatic air conditioning system on longer than necessary
when the engine is stopped.