Toyota HILUX Owner's Manual page 216

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Fogging up of the windows
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The windows will easily fog up when the humidity in the vehicle is high.
Turning the "A/C" button on will dehumidify the air from the outlets and defog
the windshield effectively. (if equipped)
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If you turn the "A/C" button off, the windows may fog up more easily. (if
equipped)
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The windows may fog up if the recirculated air mode is used.
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Outside/recirculated air mode
When driving on dusty roads such as tunnels or in heavy traffic, set the out-
side/recirculated air mode lever to the recirculated air mode. This is effective
in preventing outside air from entering the vehicle interior. During cooling
operation, setting the recirculated air mode will also cool the vehicle interior
effectively.
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When driving on dusty roads
Close all windows. If dust thrown up by the vehicle is still drawn into the vehi-
cle after closing the windows, it is recommended that the air intake mode be
set to outside air mode and the fan speed to any setting except off.
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When the outside temperature falls to nearly 0°C (32°F)
The dehumidification function may not operate even when the "A/C" button is
pressed. (if equipped)
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Air conditioning odors
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During use, various odors from inside and outside the vehicle may enter into
and accumulate in the air conditioning system. This may then cause odor to
be emitted from the vents.
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To reduce potential odors from occurring:
It is recommended that the air conditioning system be set to outside air
mode prior to turning the vehicle off.
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Air conditioning filter
→P. 382
5-1. Using the air conditioning system and defogger
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