If your question means there is no warning when the engine overheats, here are some possible reasons:
--temperature sensor in engine and/or cooling system has failed.
--fuse has blown in the circuit that provides power to the temperature sensor, warning gauge or light.
--bulb in warning light is broken.
--temperature gauge is no longer working.
--wiring between some or all of these components is damaged or missing.
Driving without a working temperature gauge or light is risky for your wallet. If the car overheats without giving a warning, by the time the driver notices steam coming from under the hood, the engine may already be permanently damaged or destroyed.
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