Toyota Yaris Owner's Manual page 102

If your engine coolant temperature is cool
with the ignition switch on, the low engine
coolant temperature indicator light comes
on. If it keeps lighting on with the engine
fully warmed, contact your Toyota dealer
as soon as possible to service the ve-
hicle.
If the high engine coolant temperature
warning light flashes, your engine is too
hot. If your vehicle overheats, stop your
vehicle and allow the engine to cool.
Your vehicle may overheat during severe
operating conditions, such as:
Driving up a long hill on a hot day.
D
Reducing speed or stopping after high
D
speed driving.
Idling for a long period with the air
D
conditioning on in stop−and−go traffic.
Towing a trailer.
D
NOTICE
z Do not remove the thermostat in
the engine cooling system as this
may cause the engine to overheat.
The thermostat is designed to con-
trol the flow of coolant to keep the
temperature of the engine within
the specified operating range.
z Do not continue driving with an
overheated engine. See "If your
vehicle overheats" on page 177 in
Section 4.
Tachometer
QS16004
The tachometer indicates engine speed
in thousands of rpm (revolutions per
minute). Use it while driving to select
correct shift points and to prevent en-
gine lugging and over−revving.
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 get segment
into the red zone. This may cause
severe engine damage.
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