Lexus ES350 Service Manual page 371

Fogging up of the windows
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The windows will easily fog up when the humidity in the vehicle is high. Selecting "A/C"
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on the option control screen will dehumidify the air from the outlets and defog the
windshield effectively.
If you turn "A/C" off, the windows may fog up more easily.
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The windows may fog up if the recirculated air mode is used.
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Outside/recirculated air mode
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When driving on dusty roads, in tunnels, or in heavy traffic, set
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recirculated air mode. This is effective in preventing outside air from entering the vehi-
cle interior. During cooling operation, setting the recirculated air mode will also cool
the vehicle interior effectively.
Outside/recirculated air mode may automatically switch depending on the tempera-
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ture setting or the inside temperature.
When the outside temperature is low
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The dehumidification function may not operate even when "A/C" on the option control
screen is selected.
Automatic mode for air intake control
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In automatic mode, the system detects exhaust gas and other pollutants and automati-
cally switches between outside air and recirculated air modes.
When the dehumidification function is off, and the fan is operating, turning automatic
mode on will activate the dehumidification function.
Micro dust and pollen filter
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In order to prevent the windshield from fogging up when the outside air is cold, the fol-
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lowing may occur:
• Outside air mode does not switch to
• The dehumidification function operates.
• The operation cancels after approximately 1 minute.
In rainy weather, the windows may fog up. Press
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In extremely humid weather, the windows may fog up.
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The pollen is filtered out even if the micro dust and pollen filter is turned off.
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Operation of the air conditioning system in Eco drive mode
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In the Eco drive mode, the air conditioning system is controlled as follows to prioritize
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fuel efficiency
• Engine speed and compressor operation controlled to restrict heating/cooling
capacity
• Fan speed restricted when automatic mode is selected
To improve air conditioning performance, perform the following operations
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• Adjust the fan speed
• Turn off Eco drive mode
ES350_OM_OM33B64U_(U)
6-1. Using the air conditioning system and defogger
(recirculated air) mode.
I n f o r ma t i o n P r o v i d e d b y :
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