TOYOTA 2011 Sienna - Manual (Page 417)

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3-1. Using the air conditioning system and defogger
3
Inte
rior fe
atures
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 wind-
shield can cause the outer surface of the windshield to fog up, blocking your
vision.
NOTICE
■ To prevent battery discharge
Do not leave the air conditioning system on longer than necessary when the
engine is stopped.