To Prevent The Windshield From Fogging Up - Subaru 2014 BRZ Owner's Manual

3-1. Using the air conditioning system and defogger
WARNING

To prevent the windshield from fogging up

I
Do not set the air outlet selection dial to
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.
CAUTION
To prevent battery discharge
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Do not leave the air conditioning system on longer than necessary when the
engine is stopped.
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during cool air operation in