Lexus LS600hL Owner's Manual page 413

Fogging up of the windows
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The windows will easily fog up when the humidity in the vehicle is high. Selecting
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"A/C" on the operation screen on 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 such as tunnels or in heavy traffic, set the outside/
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recirculated air mode button to the recirculated air mode. This is effective in pre-
venting outside air from entering the vehicle interior. During cooling operation, set-
ting the recirculated air mode will also cool the vehicle interior effectively.
Outside/recirculated air mode may automatically switch depending on the tem-
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perature setting or the inside temperature.
When the outside temperature exceeds 75°F (24°C) and the air conditioning sys-
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tem is on
In order to reduce the air conditioning power consumption, the air conditioning
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system may switch to recirculated air mode automatically. This may also reduce
fuel consumption.
Recirculated air mode is selected as a default mode when the power switch is
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turned on.
It is possible to switch to outside air mode at any time by pressing
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When the hybrid battery cooling system operates
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If the hybrid battery cooling system operates when the air conditioning is off, a
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message will be shown on the multi-information display and the air conditioning will
automatically turn on. (P. 105)
The sound of the air flow may change when cool air flows from the rear roof vents
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or the air purifier is in operation. This occurs when the hybrid battery is being
cooled and does not indicate a malfunction.
LS600hL_U(OM50D26U)
5-3. Using the air conditioning system and defogger
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