Lexus GS450h Owner's Manual page 355

Outside/recirculated air mode
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When driving on dusty roads such as tunnels or in heavy traffic, set the outside/recircu-
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lated air mode button to the recirculated air mode. This is effective in preventing out-
side air from entering the vehicle 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.
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.
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
fuel efficiency:
Engine speed and compressor operation controlled to restrict heating/cooling capac-
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ity
Fan speed restricted when automatic mode is selected
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To improve air conditioning performance, perform the following operations:
Adjust the fan speed
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Turn off Eco drive mode (P. 311)
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When the S-FLOW mode operates
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If air flows to the driver's seat only, the temperature setting for the front passenger's seat
is not displayed.
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.
Ventilation and air conditioning odors
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To let fresh air in, set the air conditioning system to the outside air mode.
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During use, various odors from inside and outside the vehicle may enter into and accu-
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mulate in the air conditioning system. This may then cause odor to be emitted from the
vents.
To reduce potential odors from occurring:
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• It is recommended that the air conditioning system be set to outside air mode prior
to turning the vehicle off.
• The start timing of the blower may be delayed for a short period of time immediately
after the air conditioning system is started in automatic mode.
GS450h_300h_OM_OM30F92E_(EE)
5-2. Using the air conditioning system and defogger
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