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      • Once warm, the thermostat activates and opens up, and when it does, the coolant can flow freely around the rest of the cooling system, including the radiator and heater, which then brings the coolant back to a safe operating temperature.
      haynes.com/en-gb/tips-tutorials/3-ways-your-thermostat-can-fail-and-what-you-can-do-about-it
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  2. If the coolant boils and the thermostat isn’t open (depending on the engine design) it may not be able to release the steam normally and may blow out a core plug or the head gasket. What should you do? Once the engine is cool, remove the thermostat housing and inspect the thermostat.

    • Your Engine is Overheating. The primary function of the thermostat is to regulate temperature. The thermostat does that by opening and closing to allow coolant to flow into and out of the engine.
    • Your Engine Doesn’t Reach the Normal Operating Temperature. Your thermostat regulates the temperature of your engine by allowing coolant to enter and then circulate to the radiator to dissipate extra heat.
    • The Engine Temperature Fluctuates Up and Down. Your thermostat regulates the flow of coolant through the cooling system and engine by opening and closing at a determined temperature.
    • You Have a Coolant Leak. A bad thermostat can prevent coolant from circulating through the engine and cooling system. When this happens, the engine can reach temperatures that will cause damage due to warping metal or gaskets that fail.
    • Overheating Engine. If the thermostat stays closed, the engine’s coolant cannot reach the radiator and, therefore, cannot cool down. This will cause the engine to overheat – which you can see in your dashboard with an ascending temperature display in the ticker – and you won’t be able to drive for more than 10 minutes before it starts overheating again.
    • Temperature Fluctuations. The thermostat gate must be perfectly timed to ensure that the engine receives the coolant at the perfect temperature. If the timing is not correct, the engine temperature will fluctuate, and the temperature gauge will respond abnormally.
    • Heater fluctations. The coolant warms up the heat inside of your car. Therefore, you might experience temperature fluctuations inside the car heater if the thermostat does not do its job properly to keep a steady temperature in the car’s engine.
    • Possible Leakages & Steam from engine. If the thermostat is not working properly, the hot coolant in the engine coolant chamber will find a way to escape because of too high pressure.
  3. Mar 21, 2023 · Coolant constantly circulates when a thermostat is stuck in the open position, even when unnecessary. Sadly, doing so will result in the engine operating below its recommended temperature range. Consequently, the engine’s fuel economy will decrease, and its components will endure excessive wear.

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  4. Mar 9, 2023 · Engine temperature increases: With the thermostat closing, the coolant pressure and temperature (in the engine) begin to increase. At 195 °F, the thermostat opens and allows coolant to circulate from the engine and into the radiator.

  5. Jul 15, 2024 · A thermostat that is stuck open: If it’s stuck open, it’s definitely going to cause some problems for you. In this scenario, the flow of coolant will be unrestricted throughout your engine and the engine warms up with difficulties. In this case, you’ll notice a significant performance drop, low power and torque.

  6. Oct 2, 2022 · As the thermostat opens and coolant starts flowing through the radiator, the temperature of the lower radiator rises quickly close to the temperature of the upper hose. At about 204°F (96°C), the radiator fan comes on and the temperature drops a few degrees.

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