It turns on if your radiator fan has not turned on when it should have and the temperature is so high that you must shut off the engine to avoid damaging it from overheating.If everything works fine and the red heat light comes on and off it must be a wiring shortcut or an ECU error display.Check the ECU for error codes logged, test your radiator fan and it's radiator valve that it work ok and your thermostat valve for normal operation.
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