Toyota 4runner 2009 User Manual page 236

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To prevent the windshield from fogging up

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

To prevent battery discharge

Do not leave the air conditioning system on longer than necessary when the

engine is stopped.

3-1. Using the air conditioning system and defogger

during cool air operation in extremely humid weather. The