cooling Lexus GX470 2004 Engine / LEXUS 2004 GX470 FROM NOV. 2003 THROUGH DEC. 2003 PROD. OWNER'S MANUAL (OM60A74U)

GAUGES, METERS AND SERVICE REMINDER INDICATORS
55
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 overheatsº on page 467.

AIR CONDITIONING
230If 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
231 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 0C (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
232This 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
234Fan 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.
VentilationFor 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

AIR CONDITIONING
235 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
Defogging and defrosting
Ð The inside of the windshieldFor 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

AIR CONDITIONING
237 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.
(d) Center vents and side vents

Center vents

Side vents
If air flow control is not satisfactory, check the center
vents and side vents. The center vents and side vents may
be opened or closed as shown.

AIR CONDITIONING
241
REAR COOLER CONTROLS
21PY034

1Rear cooler vents
2Fan speed control button
3REAR COOLº button
4Temperature control button
(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

STARTING AND DRIVING
370
ENGINE EXHAUST CAUTIONCAUTION
Avoid inhaling the engine exhaust. It contains
carbon monoxide, which is a colorless and odorless
gas. It can cause unconsciousness or even death.
Make sure the exhaust system has no holes or loose
connections. The system should be checked from
time to time. If you hit something, or notice a change
in the sound of the exhaust, have the system checked
immediately.
Do not run the engine in a garage or enclosed area
except for the time needed to drive the vehicle in or
out. The exhaust gases cannot escape, making this
a particularly dangerous situation.
Do not remain for a long time in a parked vehicle with
the engine running. If it is unavoidable, however, do
so only in an unconfined area and adjust the heating
or cooling system to force outside air into the vehicle.
Keep the back door closed while driving. An open or
unsealed back door may cause exhaust gases to be
drawn into the vehicle.

IN CASE OF AN EMERGENCY
467
IF YOUR VEHICLE OVERHEATS
If your engine coolant temperature gauge indicates
overheating, if you experience a loss of power, or if you
hear a loud knocking or pinging noise, the engine has
probably overheated.
When the engine overheats
Pull safely off the road, stop the vehicle and turn on your
emergency flashers. Put the transmission in Pº and apply the
parking brake.
A: If steam is coming from your engine:
Turn off the engine. Leave the hood closed until there is no sign
of steam or coolant. Your engine could have been seriously
damaged already. Call your Lexus dealer for assistance.
CAUTION
To help avoid personal injury, keep the hood closed until
there is no steam. Escaping steam or coolant is sign of
very high pressure.
B: If no steam is coming from your engine:
Leave the engine running and turn off the air conditioning.
Check the following.
Is the cooling fan operating?
Is the coolant in the acceptable range?
Is the engine drive belt O.K.?
CAUTION
When the engine is running, keep hands and clothing
away from the moving fan and engine drive belt.
Do not attempt to remove the radiator cap when the
engine and radiator are hot. Serious injury could
result from scalding hot fluid and steam blown out
under pressure.
If the cooling fan is not operating or the coolant is not in the
acceptable range, turn off the engine and call your Lexus
dealer.
If both conditions are O.K., after the engine coolant
temperature has cooled to normal, continue driving your
vehicle.
If the engine coolant temperature does not cool down, or your
vehicle overheats again, have it checked as soon as possible
by your Lexus dealer.