Lexus GS430 2006 Scheduled Maintenance Guide / LEXUS 2006 GS430/GS300 FROM JAN. 2006 PROD. OWNER'S MANUAL (OM30786U)

AIR CONDITIONING
267
To prevent fogging up of the windshield, the air intake mode
may change automatically to the OUTSIDE AIR mode
depending on the condition of the air conditioning system.
For example, when the ambient temperature is low, the air
intake mode may change automatically to the OUTSIDE AIR
mode. This is not a malfunction.
When the air conditioning is on, if the engine coolant
temperature becomes extremely high, the RECIRCULATED
AIR mode is automatically selected. This is not a malfunction.
When
the engine coolant temperature is lowered, the previous
mode resumes.
Turning off the air conditioning manually will cancel the
EXHAUST GAS AUTOMATIC mode. If you select the “AUTO”
mode during fan operating, the air conditioning turns on and
the EXHAUST GAS AUTOMATIC mode will operate.
For normal use, it is best to keep the air intake control button
set to OUTSIDE AIR mode. If recirculated air is used during
heating, the windows will fog up more easily. To change the sensitivity of the sensor switching between
the RECIRCULATED AIR and OUTSIDE AIR in the
AUTOMATIC mode, push the air intake control button and
hold it for a few seconds. The display changes to the one
illustrated below.
The sensitivity of the sensor can be adjusted only while the
vehicle has been stopped.
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The sensitivity of the switches is set to be higher toward “HI”
and lower toward “LO”.
Touch the desired switch on the screen.
When
you push any button except the air intake control button,
the above screen goes off.

AIR CONDITIONING
268If manual onoff of the air conditioning is desired—
Touch
the ”A/C” switch to turn the air conditioning on and touch
it again to turn the air conditioning off. If you turn off the air
conditioning manually, the EXHAUST GAS AUTOMATIC
mode will be cancelled.
If the outside temperature is lowered down to around 0 C
(32 F), the air conditioning will turn off automatically. At this
time, the indicator on the A/C switch is off and the EXHAUST
GAS AUTOMATIC indicator light remains on. However, the
EXHAUST GAS AUTOMA TIC mode does not operate. When
the air conditioning turns on as with the raised temperature, the
EXHAUST GAS AUTOMATIC mode resumes.
If the system is used for ventilation, heating in dry weather or
removing frost or exterior fog on the windshield, turn the air
conditioning off once it is no longer required. This will improve
fuel economy. The air conditioning can be used for year −round
automatic temperature control including cooling and
dehumidifying operation.
If the air conditioning compressor does not operate, the
indicator of the ”A/C” switch will blink. If the indicator of the
”A/C” switch blinks even when the ”A/C” switch is touched
again, have the compressor checked by your nearest Lexus
dealer.
(b) Windshield defogging and defrosting
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To remove interior fog on the windshield—
Push the windshield air flow button.
To remove frost or exterior fog on the windshield—
1. Push the “TEMP” (”
”) button to set the “HI”.
2. Push the windshield air flow button.
3. Touch fan speed control switch on the right side to obtain a
maximum air flow.
4. Leave the “A/C” switch off.

AIR CONDITIONING
269
When the windshield air flow button is pushed while operating
in automatic mode, the air conditioning is set to operate and the
OUTSIDE AIR mode is set. This is to clean up the front view
more quickly. If you want
to return the setting to the
RECIRCULATED AIR mode, push the air intake control button
once again.
Touch the “A/C” switch for dehumidified heating or cooling.
This setting clears the front view more quickly.
If you push the windshield air flow button once again while in
the windshield air flow mode, the mode then returns to the last
mode used.
CAUTION
Do not use the windshield air flow button during cooled
air operation in extremely humid weather. The
difference between the temperature of the outside air
and that of the windshield could cause the outer surface
of the windshield to fog up blocking your vision.
(c) Micro dust and pollen filter
This vehicle is equipped with a micro dust and pollen filter
mode. When this mode is activated, air from the vents will
remove pollen on the driver and passengers.
Use this mode to remove pollen quickly carried by the
driver or passengers or through the window in the days
with much pollen.
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Push the micro dust and pollen filter button.
The indicator light comes on and RECIRCULATED AIR mode
is turned on. Air is delivered from the instrument panel vents
to the areas near the driver and passengers to remove pollen
on them. When the interior is purified sufficiently with fresh air
after about 3 minutes, this mode will be turned off automatically
and the indicator light will go out.

AIR CONDITIONING
270However, when the outside temperature is low, the indicator
light
comes on and the “A/C” switch turns on, but the air intake
control remains the same. When the interior is purified
sufficiently with fresh air after about 1 minute, this mode will be
turned off automatically and the indicator light will go out, but
the “A/C” switch remains on.
When the micro dust and pollen filter is activated, this mode will
be turned off by pushing any of the following buttons:
 Micro dust and pollen filter button
 “A/C” button
 Windshield air flow button
The indicator light will go out when the mode is turned off.
INFORMATION
 Use and push the windshield air flow button to
remove the fog on the windshield in rainy days.
 Fresh air is delivered even when the micro dust and
pollen filter button is turned off.
(d) Operating tips
To help cool down the interior after parking in the hot sun,
drive for the first few minutes with the windows open. After
the excess heat has blown away, close the windows.
 Make sure the air inlet grilles in front of the windshield are
not blocked by leaves or other obstructions.
 If air flow control is not satisfactory, check the dashboard
vents and rear vents. (See (e) “Center vents, side vents and
rear vents”.)
 Only humid days, do not blow cold air on the windshield.
The windshield could fog up because of the difference in air
temperature on the inside and outside of the windshield.
 Keep the area under the front seats clear to allow air to
circulate throughout the vehicle.
 On cold days, set the fan speed to high for a minute to help
clear the intake ducts of snow or moisture. This can reduce
the amount of fogging on the windows.
 When driving on dusty roads, close all windows. If dust
thrown up by the vehicle is still drawn into the vehicle after
closing the windows, it is recommended that the air intake
control button be set to the OUTSIDE AIR mode to take in
the fresh air and the fan speed selector to any setting except
OFF.

AIR CONDITIONING
271

If following another vehicle on a dusty road, or driving in
windy and dusty conditions, it is recommended that the air
intake control button be temporarily pressed in to the
RECIRCULATED AIR mode, which will close off the outside
passage and prevent outside air and dust from entering the
vehicle interior.
Heating
For best results, set controls to:
For automatic operation—
Push in the “AUTO” button.
Temperature—To the desired temperature
Air intake—OUTSIDE AIR
Air conditioning—OFF
For manual operation—Fan speed—To the desired fan speed
Temperature—Towards high temperature
Air intake—OUTSIDE AIR
Air flow—FLOOR
Air conditioning—OFF
 For quick heating, select RECIRCULATED AIR mode for a
few minutes. To keep the windows from fogging, select
OUTSIDE AIR mode after the vehicle interior has been
warmed.
 Touch the “A/C” switch on for dehumidified heating.
 Choose floor/windshield air flow to heat the vehicle interior
while defrosting or defogging the windshield.
Air conditioning
For best results, set controls to:
For automatic operation—
Push in the “AUTO” button.
Temperature—To the desired temperature
Air intake—OUTSIDE AIR
Air conditioning—ON

AIR CONDITIONING
272For manual operation—
Fan speed—To the desired fan speed
Temperature—Towards low temperature
Air intake—OUTSIDE AIR
Air flow—PANEL
Air conditioning—ON
 For quick cooling, select RECIRCULATED AIR mode for a
few minutes.
Ventilation
For best results, set controls to:
For automatic operation—
Push in the “AUTO” button.
Temperature—Towards low temperature
Air intake—OUTSIDE AIR
Air conditioning—OFF
For manual operation—Fan speed—To the desired fan speed
Temperature—Towards low temperature
Air intake—OUTSIDE AIR
Air flow—PANEL
Air conditioning—OFF
Defogging and defrosting
—The inside of the windshield
For best results, set controls to:
For automatic operation—
Temperature— Towards high temperature to heat; low temperature to cool
Air intake—OUTSIDE AIR
Air flow—WINDSHIELD
For manual operation—
Fan speed—To the desired fan speed
Temperature— Towards high temperature to heat; low temperature to cool
Air intake—OUTSIDE AIR
Air flow—WINDSHIELD
When the windshield air flow button is pushed, air flows mainly
from the windshield vents and turns on the defogging function
with the purpose of clearing the front view.
Pushing this button once again returns the air flow mode to the
last one used.
This button allows the air intake to select OUTSIDE AIR mode
automatically. This is to clean up the front view more quickly.
If you want to return the setting to RECIRCULATED AIR mode,
push the air intake control button once again.

AIR CONDITIONING
273
Touch the “A/C” switch for dehumidified heating or cooling.
This setting clears the front view more quickly.

Only humid days, do not blow cold air on the
windshield—the dif ference between the outside and inside
temperatures could make the fogging worse.
—The outside of the windshield
For best results, set controls to:
For automatic operation—
Temperature— Towards high temperature
Air intake—OUTSIDE AIR
Air flow—WINDSHIELD
For manual operation—Fan speed—To the desired fan speed
Temperature— Towards high temperature
Air intake—OUTSIDE AIR
Air flow—WINDSHIELD
When the windshield air flow button is pushed, air flows mainly
from the windshield vents and turns on the defogging function
with the purpose of clearing the front view.
Pushing this button once again returns the air flow mode to the
last one used. This
button allows the air intake to select OUTSIDE AIR mode
automatically. This is to clean up the front view more quickly.
If you want to return the setting to RECIRCULATED AIR mode,
push the air intake control button once again.
Touch the “A/C” switch for dehumidified heating or cooling.
This setting clears the front view more quickly.
 To heat the vehicle interior while defrosting the windshield,
choose floor/windshield air flow.
(e) Center vents, side vents and rear vents
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Center vents

AIR CONDITIONING
274
G21016
Side vents (driver’s side)
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Side vents (front passenger’s side)
G21017
Rear vents
If air flow control is not satisfactory, check the center
vents, side vents and rear vents. They may be opened or
closed as shown.
When outside temperature is low like a winter season, air flow
temperature from the center vents, side vents and rear vents
may not be warmed up enough for a while until the engine
coolant temperature becomes high enough.
If air flow from the center vents, side vents and rear vents is not
satisfactory, air flow direction can be changed manually by
adjusting the vents fin direction or the vents may be closed.

AIR CONDITIONING
275
(f) Replacing the air conditioning filter
G21011
The air conditioning filter information label is placed in the
glove box as shown and indicates that a filter has been
installed.
The air conditioning filter, in addition to removing odors,
prevents dust and pollen from entering the vehicle through the
air conditioning vent.
G21012
The air conditioning filter is behind the glove box.
The air conditioning filter may clog after long use. The filter
may need to be replaced if the air flow of the air conditioning
and heater experiences extreme reductions in operating
efficiency, or if the windows fog up easily.
If the symptoms of air conditioning efficiency problems occur,
contact your nearest Lexus dealer to have the filter cleaned or
replaced.
To maintain the air conditioning efficiency, replace the air
conditioning filter according to the maintenance schedule. In
dusty areas or areas with heavy traffic flow, such as inner city
or desert areas, early replacement may be required. (For
scheduled maintenance information, see the “Owner’s Manual
Supplement / Scheduled Maintenance”).

AIR CONDITIONING
2761. Turn the air intake control to RECIRCULATED AIR
mode.
The filter case cannot be removed in the OUTSIDE AIR mode.
2. Turn off the engine switch.
3. When you replace the filter, be sure to turn off the fan.
G21013
4. Open
the glove box and remove the partition by pulling.
G21019
5. Pull the filter cover toward you.
G21020
6. Push the tabs and pull the filter case toward you.