What Are the Most Common Symptoms of a Bad Car Thermostat?

Symptoms of a Bad Thermostat in a car, showing a thermostat component, engine cooling system, and temperature warning indicators by Car Garage Expert.

Common symptoms of a bad thermostat include engine overheating, a temperature gauge that stays too low, slow engine warm-up and a heater that blows cold air. You may also notice changing engine temperatures, poor fuel economy or coolant leaks near the thermostat housing. These problems often occur when the thermostat gets stuck open or closed. … Read more