Toyota Yaris: Engine coolant temperature indicator and warning light
1. Low engine coolant temperature indicator light.
2. High engine coolant temperature warning light.
The indicator and warning lights indicate the engine coolant temperature when the ignition switch is on. The engine operating temperature will vary with changes in weather and engine load.
The high engine coolant temperature warning light will come on when the ignition key is turned to the “ON” position. After a few seconds, the light will go off.
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 vehicle.
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.
Reducing speed or stopping after high speed driving.
Idling for a long period with the air conditioning on in stop-and-go traffic.
Towing a trailer.
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 overheats”.
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