Engines are typically cooled via airflow and circulated coolant. The temperature guage monitors these processes for anomalies. Usually the gauges come on when the engine is running hot. Overheating can be an expensive repair so it needs to be addressed ASAP. Course this assumes that you don't live in a subzero climate:)
Since airflow is critical keep an eye out for road debri. A simple plastic bag spread across your grill can block off some airflow. Check & change your coolant levels at recommended intervals. Also check and replace your coolant hoses periodically. These simple checks can uncover problems before they leave you stranded.
That's the short story.... In summary, if your temp gauge is on, you need to have that checked ASAP.
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