Why is the Thermostat Prone to Failure?

[LandonRose]

Due to prolonged warm-up time, electric flatbed trucks operate at lower water temperatures, causing combustion gases to react with condensed water on the cylinder walls, forming acidic substances that corrode the cylinders and lead to thermostat failure. Below is an introduction to the thermostat: 1. Device Introduction: The thermostat automatically adjusts the amount of water entering the radiator based on the coolant temperature, altering the water circulation range to regulate the cooling system's heat dissipation capacity, ensuring the engine operates within an appropriate temperature range. 2. Working Principle: The most commonly used thermostat is the wax-type thermostat. When the coolant temperature is below the specified value, the refined paraffin inside the thermostat's temperature-sensing body remains solid, and the thermostat valve, under the action of a spring, closes the passage between the engine and the radiator. The coolant then returns to the engine via the water pump, initiating a small internal circulation within the engine.

[OKinsley]

I've been driving a used car for several years, and the thermostat often gives me trouble, which is quite annoying. The main issue is that this component is constantly submerged in high-temperature coolant. When the engine starts, it's hit with a surge of heat, and when it stops, it cools down again. This repeated thermal expansion and contraction can easily cause the internal spring and valve of the thermostat to expand, deform, and get stuck. There's also the problem of corrosion—if the coolant is of poor quality or not changed frequently, scale and rust can build up inside, further damaging the thermostat. Especially in city traffic jams, when the engine temperature soars, the thermostat is more prone to overheating. My advice is to change the coolant every two years and avoid cheap products. Driving habits also play a role; if you frequently accelerate or brake hard, the drastic temperature changes can put extra strain on the thermostat. If the engine temperature gauge shows abnormal readings, stop immediately and check for repairs. A little trick to extend its lifespan is to keep an eye on the water temperature and avoid driving too aggressively in hot weather.

[MarianaMarie]

Experience tells me that the thermostat is as fragile as paper. After driving hundreds of thousands of kilometers, I've often seen it get stuck or leak due to seal aging. The core issue is metal fatigue under the engine's high temperature and pressure, leading to rapid aging and cracking. Additionally, if the cooling system has too many impurities, like rust buildup in the radiator, it can block the thermostat valve, preventing it from opening or closing. Improper installation is also a culprit—misaligned screws or damaged gaskets create uneven pressure, accelerating failure. Prevention involves regular cleaning of the entire cooling circuit, including the water pump and radiator, and using OEM parts for replacements to ensure compatibility. Driving conditions also play a big role; for example, constant highway driving or operation in hot climates significantly increases failure rates. Develop a habit: visually inspect hoses and connections monthly, and address any abnormalities early to save money and hassle.

[VivianLee]

Thermostats often fail mainly due to aging, corrosion, and sticking. Long-term exposure to thermal stress damages the materials, and large temperature fluctuations can cause cracking or deformation. Dirty coolant can block the valve passages, and accumulated impurities can immobilize moving components. Unstable engine conditions, such as overheating in traffic jams or frequent cold starts, also accelerate wear. Choosing higher-quality antifreeze coolant can help mitigate corrosion. Regularly replacing the coolant and checking pressure are key preventive measures.

[DelaneyDella]

When you notice the engine temperature fluctuating while driving, the thermostat is often the culprit. It fails quickly due to internal component rusting and seizing, or poor sealing causing leaks. Causes include neglect in cooling system maintenance, such as not changing the coolant for years leading to accelerated corrosion, or installation misalignment causing uneven pressure. The risks are significant—if stuck, it can cause overheating, cylinder scoring, or even hose bursts. It's recommended to flush the radiator and water pump every 30,000 kilometers and replace the thermostat to prevent unexpected failures. Safety first—if the dashboard warning light comes on, stop and inspect immediately. Adding antifreeze additives can extend the system's lifespan and reduce failure frequency. Don't ignore minor issues; they can lead to costly repairs.