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Car encyclopedia

Thermostat

The thermostat is a mechanical device that controls engine temperature. It blocks coolant flow to the radiator until the engine reaches a predetermined temperature. This allows the engine to warm up quickly and efficiently.

Symptoms of Wear or Failure

  • Thermostat housing may leak coolant
  • Engine may overheat or never reach normal temperature
  • Higher exhaust emissions
  • Check Engine Light may illuminate
  • Poor fuel mileage

Related Repair Advice

  • A high-quality OEM thermostat should be used. Poor quality thermostats may not function properly and can cause damage to the engine or components of the emission system.
  • We recommend replacing the thermostat any time major repairs are performed on the cooling system

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