Lexus 2004 GX470 Owner's Manual page 67

GAUGES, METERS AND SERVICE REMINDER INDICATORS
ENGINE COOLANT
TEMPERATURE GAUGE
" Normal range
The gauge indicates the engine coolant temperature when
the ignition switch is on.
temperature will vary with changes in weather and engine
load.
If the needle points to the red zone or higher, stop your vehicle
and allow the engine to cool.
Your vehicle may overheat during severe operating conditions,
such as:
D Driving up a long hill on a hot day.
D Reducing speed or stopping after high speed driving.
D Idling for a long period with the air conditioning on in
stop-and-go traffic.
D Towing a trailer.
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It is not a malfunction even if the needle of the engine coolant
temperature gauge returns to "C" when the ignition switch is
turned to the "START".
The engine operating