2004 Lexus GX470 cooling

GAUGES, METERS AND SERVICE REMINDER INDICATORS
59
NOTICE
Do not remove the thermostat in the engine coolingsystem as this may cause the engine to overheat. Thethermostat is designed to control the flow of coolantto keep the temperature of the engine within thespecified operating range.
Do not continue driving with an overheated engine.See If your vehicle overheatsº on page 485.

AIR CONDITIONING
242If quick heating or cooling is desired Ð
Push the TEMPº or PASSENGER TEMPº button on either
side
and hold it until MAX. HOTº or MAX. COLDº appears on
the display.
If manual fan speed control is desired Ð

1Fan speed at low2Fan speed at high
The fan speed can be set to your desired speed by pushing the
appropriate side of fan speed control button. The higher the fan
speed is, the more air is delivered. Pushing the OFFº button
turns off the fan.
To remove exterior windshield frost, use the high speed setting. If manual switching of air intake is desired Ð
Each time you push the air intake control button, the mode
changes in order from the RECIRCULATED AIR mode to
OUTSIDE AIR mode, then back to the RECIRCULATED AIR
mode. Each indicator light shows which mode is now selected.
1RECIRCULATED AIR mode Ð
If quick circulation of
cooled air is desired, select this mode.
2OUTSIDE AIR mode Ð The system will take fresh
outside air into the vehicle.
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.

AIR CONDITIONING
243
If quick circulation of cooled air is desired, push the air intake
control
button for RECIRCULATED AIR. The indicator light will
come on.
For normal use, it is best to keep the air intake control button
set to the OUTSIDE AIR mode. If recirculated air is used during
heating, the windows will fog up more easily.
If manual on-off of the air conditioning is desired Ð
Push the A/Cº button to turn the air conditioning on and push
it again to turn the air conditioning off.
The air conditioning does not work if the outside temperature
is lowered down to around 0 C (32F).
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/Cº button will blink. If the indicator of the
A/Cº button blinks even when the A/Cº button is pushed
again, have the compressor checked by your nearest Lexus
dealer.
(b) Windshield defogging and defrosting
To remove interior fog on the windshield Ð
Push the windshield air flow button.
To remove frost or exterior fog on the windshield Ð
1. Push the TEMPº button to set the maximum temperature.
2. Push the windshield air flow button.
3. Push the fan speed control button on the right side to obtain
a maximum air flow.
4. Leave the A/Cº button off.
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.

AIR CONDITIONING
244This button allows the air intake to select the OUTSIDE AIR
mode automatically. 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.
Push the A/Cº button for dehumidified heating or cooling. This
setting clears the front view more quickly.
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) 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 side vents and
rear vents. (See (d) Center vents and side ventsº.)
 On 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
be set to the OUTSIDE AIR mode and the fan speed to any
setting except OFFº.

AIR CONDITIONING
246Fan speed Ð
To the desired fan speed
Temperature Ð Towards low temperature
Air intake Ð OUTSIDE AIR
Air flow Ð PANEL
Air conditioning Ð ON
 For quick cooling, select RECIRCULATED AIR for a few
minutes. Ventilation
For best results, set controls to:
For automatic operation Ð
Push in the AUTOº button.
Temperature Ð Towards low temperature
Air intake Ð OUTSIDE AIR
Air conditioning Ð OFF
For manual operation Ð Fan speed Ð To the desired fan speed
Temperature Ð Towards low temperature
Air intake Ð OUTSIDE AIR
Air flow Ð PANEL
Air conditioning Ð OFF

AIR CONDITIONING
247
Defogging and defrosting
Ð The inside of the windshield
For best results, set controls to:
For automatic operation Ð
Temperature Ð Towards high temperature to heat;
low temperature to cool
Air intake Ð OUTSIDE AIR
Air flow Ð WINDSHIELD
For manual operation Ð
Fan speed Ð To the desired fan speed
Temperature Ð Towards high temperature to heat;
low temperature to cool
Air intake Ð OUTSIDE AIR
Air flow Ð 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.
Push the A/Cº button for dehumidified heating or cooling. This
setting clears the front view more quickly. 
On humid days, do not blow cold air on the windshield Ð the
difference between the outside and inside temperatures
could make the fogging worse.
Ð The outside of the windshield
For best results, set controls to:
For automatic operation Ð
Temperature Ð Towards high temperature
Air intake Ð OUTSIDE AIR
Air flow Ð WINDSHIELD
For manual operation Ð

AIR CONDITIONING
248Fan speed Ð
To the desired fan speed
Temperature Ð Towards high temperature
Air intake Ð OUTSIDE AIR
Air flow Ð 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.
Push the A/Cº button 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.

AIR CONDITIONING
254
(a) Rear cooler ON-OFF
To turn the rear cooler on, push the REAR COOLº button
with front air conditioning on. To turn the rear cooler off,
push the button once again.
When you turn the rear cooler on with the front air conditioning
off, the cooling device is not operated.
(b) Air flow control
The fan speed can be set to your desired speed by pushing
the appropriate side of the fan speed control button. AUTOº mode:
The fan speed is automatically adjusted only
when the air flow setting of the front air conditioning is in the
panel mode.
(c) Temperature control
The temperature of the cooled air can be adjusted between

10 F (
5C) of the temperature of the front air
conditioning system. Push the left side of the button to
lower the temperature.
NOTICE
To prevent the battery from being discharged, do not leave the rear cooler on longer than necessary when the
engine is not running.