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What is a Car Thermostat?

A car thermostat is a vital part of your engine cooling system that regulates your vehicle’s temperature for optimal performance. It controls coolant flow between the engine and the radiator, ensuring your engine warms up quickly and stays at the right temperature.

Things to Know

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Why Your Car Thermostat is Important

  • Prevents Overheating – Stops excessive heat buildup that can damage the engine.

  • Prevents Overcooling – Keeps engine from running too cold, which wastes fuel.

  • Improves Efficiency – Maintains the ideal temperature for performance and emissions.

Signs of a Bad Thermostat

  • Engine overheating

  • Engine takes too long to warm up

  • Temperature gauge fluctuates

  • Poor fuel economy

This diagram shows how coolant flows through the water pump, thermostat housing, radiator, and engine.

This diagram shows how coolant flows through the water pump, thermostat housing, radiator, and engine.

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