The most common signs of a broken thermostat are: The thermostat display is off or is non-responsive when you try to adjust it. The display on the digital screen is faded or incomplete.
How do I know if my car thermostat is bad?
The first and potentially most alarming symptom will be the temperature gauge reading high into the red within the first 15 minutes of your vehicle engine running. This is often the first sign that the thermostat is not functioning properly.
How do I test my thermostat?
How do I test my thermostat? 1 Open the radiator back. 2 Turn on the engine and allow it to idle. 3 When you start the engine, the thermostat will not allow coolant passage to the radiator because the engine has not... 4 If there is no coolant passage at first, and even when the car heats up, you have a stuck close thermostat. More ...
What happens when a thermostat goes bad?
A bad thermostat will not allow adequate coolant flow when required, resulting in engine overheat or lowers your engine temperature if it stays at a stuck open position, affecting your engine lubricating force.
What happens to the thermostat when the engine gets heated up?
But when the engine gets heated up, the thermostat will gradually open up allowing the coolant to pass to the radiator for cooling purposes. Once the coolant and engine temperature sticks below 195f, the thermostat will gradually start closing to provide the normal engine temperature.
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