2006 Lexus GS430 cooling

GAUGES, METERS AND SERVICE REMINDER INDICATORS
71

Idling for a long period with the air conditioning on in
stop−and−go traffic.
NOTICE
Do not remove the thermostat in the engine cooling
system as this may cause the engine to overheat. The
thermostat is designed to control the flow of coolant
to keep the temperature of the engine within the
specified operating range.
 Do not continue driving with an overheated engine.
See ”If your vehicle overheats” on page 473.
TACHOMETER
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The tachometer indicates engine speed in thousands of
rpm (revolutions per minute). Use it while driving to
prevent engine overrevving.
Driving with the engine running too fast causes excessive
engine wear and poor fuel economy. Remember, in most
cases the slower the engine speed, the greater the fuel
economy.
NOTICE
Do not let the indicator needle get into the red zone. This
may cause severe engine damage.

AIR CONDITIONING
262
(a) Climate control
SETTING OPERATION automatic control
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1. Push the “AUTO” button.
An indicator light will illuminate to show that the automatic
operation mode has been selected.
Air flow quantity, switching of the diffusers, on−off of the air
conditioning, and switching of the air intake between
RECIRCULATED AIR and OUTSIDE AIR are automatically
adjusted. The operation status is shown by each indicator.
When one of the manual control buttons is depressed while
operating in automatic mode, the mode relevant to the
depressed button is set. Other conditions continue to be
adjusted automatically.
Push the ”OFF” button to turn the air conditioning off.
INFORMATION
 This automatic control had additional functions as
described below, when the “AUTO” button is pushed.
The fan is stopped for a little while until warm air
preparation, when outside temperature is low like a
winter season in the “Floor”, “Bilevel” or
“Floor/Windshield” air flow mode. If quick removal
for exterior frost, fog and inside fog on the windshield
is desired, use the high fan speed setting after the
“Windshield” air flow mode has been selected.
The fan is stopped few seconds until cool air
preparation, when outside temperature is high like a
summer season in the “Panel” or “Bilevel” air flow
mode.
 The internal circulation may be applied for maximum
cooling in the automatic operation mode, when
outside temperature is high like a summer season.
If fresh outside air is desired into the vehicle, push
the air intake control button to select the OUTSIDE
AIR mode.

AIR CONDITIONING
263

The “Floor/Windshield” air flow mode may be applied
automatically, if the outside temperature is lowered
down to below 0C (32F).
This is not a malfunct ion. The “Floor/Windshield” air
flow mode turns on the defogging and defrosting
function with the purpose of clearing your front view
for safe driving.
If the “Floor” air flow mode is desired with the main
purpose of heating, “Floor” air flow mode can be
selected manually by touching the air flow control
switch.
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2. Use the “TEMP” or ”PASSENGER TEMP” buttons to set
the desired vehicle interior temperature.
The “TEMP” or “PASSENGER TEMP” (“
”, “”) buttons are
used to set the desired interior temperature. The interior
temperature will be controlled on the driver and passenger side
simultaneously or individually.
To increase the interior temperature, push the “
” button, to
decrease it, push the “” button.
If quick heating or cooling is desired—
“LO” appears when you hold “
” until maximum cooling, and
“HI” appears when you hold “” until maximum heating.
“TEMP” buttons—Changes the temperature on the driver
and passenger sides simultaneously or the driver side only.
“PASSENGER TEMP” buttons—Changes the temperature
settings separate from the driver side.

AIR CONDITIONING
264“DUAL” switch—
This switch is used to set the temperatures independently for
the driver’s seat and front passenger seat.
Touching the switch changes from the independent mode to
the linked mode.

Independent mode: Temperatures can be set
independently for the driver’s seat and front passenger’s
seat. The indicator light will come on to show that the
independent mode has been selected.
 Linked mode: The same temperature is set for the driver’s
seat and front passenger’s seat. The indicator light will turn
off to show that the simultaneous temperature setting mode
has been selected.
When the temperature for the front passenger’s seat is
changed in linked mode, the mode is changed automatically to
independent mode.
INFORMATION
Knowledge for the twotemperature selector operation
This air conditioning system has two independent
temperature selectors: left and right (for the use of
driver and front passenger respectively).
 There are cases where the temperature of the air flow
may not accurately correlate on the driver and front
passenger side according to circumstances, even if
the left and right temperature selectors are set at the
same temperature. If this situation occurs, use the
fine tune operation to adjust the air temperature on
one side.
 There are cases where one or both of the air flow
temperatures may not accurately correlate with the
set temperature according to circumstances, when
the air flow temperature settings on the left and right
are substantially different. For example, if the left
controller is set at central or neutral temperature
while the right one is set at maximum heating or
maximum cooling, or vice versa. If this situation
occurs, use the fine tune operation to adjust the air
temperature on each side.

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
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