2009 Lexus IS250 cooling

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(a) Climate control
SETTING OPERATION−automatic con-
trol
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 switch-
ing of the air intake between RECIRCU-
LATED AIR and OUTSIDE AIR are auto-
matically 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 fan off.
INFORMATION
DThis automatic control has addi-
tional function as described below,
when the “AUTO” button is
pushed.
The fan speed is stopped for a little
while until warm air preparation,
when outside temperature is cold
like a winter season in the “Floor”,
“Bi− level” 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 speed is stopped few sec-
onds until cool air preparation,
when outside temperature is hot
like a summer season in the “Pan-
el” or “Bi− level” air flow mode.
D The internal circulation may be ap-
plied for maximum cooling in the
automatic operation mode, when
outside temperature is hot like a
summer season.
If fresh outside air is desired into
the vehicle, push the air intake
control button to select the OUT-
SIDE AIR mode.
D The “Floor/Windshield” air flow
mode may be applied automatical-
ly, if the outside temperature is
lowered down to below 0 _C (32 _F).
This is not malfunction. The
“Floor/Windshield” air flow mode
turns on the defogging and de-
frosting function with the purpose
of cleaning your front view for safe
driving.
If the “Floor” air flow mode is de-
sired with the main purpose of
heating, “Floor” air flow mode can
be selected manually by touching
the air flow control button.
IS F/350/250_Navi_U
(L/O 0808)

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2. Use the “TEMP” or “PASSENGER
TEMP” button to set the desired vehicle
interior temperature.
The“TEMP” or“PASSENGER TEMP”
(“
” ,“” ) buttons are used to set the de-
sired interior temperature. The interior
temperature will be controlled on the driver
and passenger side simultaneously or in-
dividually.
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 it until maxi-
mum cooling (decrease), and “HI” appears
when you hold it until maximum warning
(increase).
“TEMP” button — Changes the tempera-
ture on the driver and passenger sides si-
multaneously or the driver side only.
“PASSENGER TEMP” button —
Changes the temperature settings sepa-
rate from the driver side.
“DUAL” —
This button is used to set the temperatures
independently for the driver ’s seat and
front passenger seat.
Touching the button changes from the in-
dependent mode to the linked mode.
Independent mode: Temperatures can
be set independently for the driver ’s seat
and front passenger ’s seat. The indicator
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 passen-
ger’s seat. The indicator will come off to
show that the simultaneous temperature
setting mode has been selected.
When the temperature for the front pas-
senger ’s seat is changed in linked mode,
the mode is changed automatically to inde-
pendent mode.
IS F/350/250_Navi_U
(L/O 0808)

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INFORMATION
Knowledge for the two−temperature
selector operation:
This air conditioning system has two
independent temperature selectors:
left and right (for the use of driver and
front passenger respectively).
D There are cases where the temper-
ature of the airflow may not accu-
rately 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 sit-
uation occurs, use the fine tune op-
eration to adjust the air tempera-
ture on one side.
D There are cases where one or both
of the airflow temperatures may
not accurately correlate with the
set temperature according to cir-
cumstances, when the airflow tem-
perature settings on the left and
right are substantially different.
For example, if the left controller is
set at central or neutral tempera-
ture while the right one is set at
maximum heating or maximum
cooling, or vice versa. If this situa-
tion occurs, use the fine tune op-
eration to adjust the air tempera-
ture on each side.
Driver side setting air flow
Passenger side setting air flow
Mixed air flow
IS F/350/250_Navi_U
(L/O 0808)

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To change the sensitivity of the sensor
switching between the RECIRCU-
LATED AIR and OUTSIDE AIR in the AU-
TOMATIC mode, push the air intake
control button and hold it for a few sec-
onds.
The “Smog Sensor” screen will be dis-
played.
The sensitivity of the sensor can be ad-
justed only while the vehicle has been
stopped.
The sensitivity of the touch−screen button
is set to be higher toward “HI” and lower to-
ward “LO”.
Touch the desired button on the screen.
When you push the “AUTO”button, the
above screen goes off. If manual on
−off of the air conditioning
is desired —
Touch “A/C” to turn the air conditioning on
and touch it again to turn the air condition-
ing off. If you turn off the air conditioning
manually, the EXHAUST GAS AUTOMAT-
IC mode will be cancelled.
If the outside temperature is below 0 _C
(32 _F), the air conditioning will turn off au-
tomatically. At this time, the indicator on
“A/C” is off and the EXHAUST GAS AU-
TOMATIC indicator light remains on. How-
ever, the EXHAUST GAS AUTOMATIC
mode does not operate. When the air con-
ditioning turns on as with the raised tem-
perature, the EXHAUST GAS AUTOMAT-
IC mode resumes.
If the system is used for ventilation, heat-
ing in dry weather or removing frost or ex-
terior fog on the windshield, turn the air
conditioning off once it is no longer re-
quired. This will improve fuel economy.
The air conditioning can be used for year −
round automatic temperature control in-
cluding cooling and dehumidifying opera-
tion.
If the air conditioning compressor does not
operate, the indicator of “A/C”will blink.
If the indicator of “A/C”blinks even when
“A/C” is touched again, have the com-
pressor checked by your Lexus dealer.
IS F/350/250_Navi_U
(L/O 0808)

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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
DFor quick heating, select RECIRCU-
LATED AIR mode for a few minutes. To
keep the windows from fogging, select
OUTSIDE AIR mode after the vehicle
interior has been warmed.
DTouch “A/C” on for dehumidified heat-
ing.
DChoose floor/windshield air flow to
heat the vehicle interior while defrost-
ing 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
For manual operation —
Fan speed — To the desired fan speed
Temperature — Towards low
temperature
Air intake — OUTSIDE AIR
Air flow — PANEL
Air conditioning — ON
DFor quick cooling, select RECIRCU-
LATED 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
IS F/350/250_Navi_U
(L/O 0808)

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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 wind-
shield 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 RECIR-
CULATED AIR mode, push the air intake
control button once again.
Touch “A/C” for dehumidified heating or
cooling. This setting clears the front view
more quickly.
DOn humid days, do not blow cold air on
the windshield −the difference be-
tween the outside and inside tempera-
tures 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 wind-
shield 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 RECIR-
CULATED AIR mode, push the air intake
control button once again.
Touch “A/C” for dehumidified heating or
cooling. This setting clears the front view
more quickly.
DTo heat the vehicle interior while de-
frosting the windshield, choose floor/
windshield air flow.
IS F/350/250_Navi_U
(L/O 0808)