How to Tell Car Thermostat Is Bad (Symptoms of Stuck Open Stuck Closed and Overheating)

Symptoms and signs of a stuck open, stuck closed, partially stuck open car thermostat. Learn what cause it to fail, why it is important for the cooling and heating system and how it can affect engine tperformance. A bad thermostat will cause the engine to overheat, run cooler and cause temperature fluctuations depending whether it is stuck open or closed. Always replace the thermostat when it is leaking. In addition, make sure the thermostat hole is facing up installing. Top5autorepairs Subscribe