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Although car cooling systems are designed to maintain a fairly constant working temperature, the actual engine temperature can vary for a number of reasons. It may even reach such a high level that engine damage becomes a possibility.
Bi-metallic strip gauges
Bi-metallic strip gauges creep up to their readings gradually when you switch on the ignition.
The sensor unit allows a current, varying with the engine temperature, through to a heater coil inside the gauge.
A bi-metallic strip inside the coil bends by an amount depending on the size of the current and deflects the needle across a calibrated scale to give a temperature reading.
The temperature gauge provides an early warning of overheating, allowing you to stop the car before any damage occurs. In very cold weather, the gauge can also tell you if the engine is being overcooled (which will increase fuel consumption and engine wear). You can then take preventative means, such as blocking off part of the radiator or changing the thermostat.
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