What are the reasons for the thermostat frequently failing?
2 Answers
The reasons for the frequent failure of the thermostat are: 1. Due to prolonged warm-up time, the engine operates at a low water temperature, causing combustion gases and condensed water on the cylinder walls to form acidic substances that corrode the cylinders; 2. Liquid fuel and water wash away the lubricating oil film on the cylinder walls and flow down to the oil pan, diluting the lubricating system's oil, leading to wear on the cylinder liners and piston components; 3. If the cylinder block has defects repaired with adhesive, excessive temperature fluctuations between cold and hot cause frequent contraction and expansion of the cylinder block, which can cause the adhesive to fall off, resulting in diesel engine malfunctions. The thermostat is a key component in controlling the engine's water temperature. When damaged, it prevents the engine's water temperature from being maintained between 90 and 150 degrees Celsius.
I've encountered many car owners complaining about frequent thermostat failures, mostly due to scale or corrosion buildup in the cooling system that hinders spring movement. Combined with frequent vehicle use and large temperature fluctuations, this accelerates wear. Some cases involve improper alignment during installation, leading to leaks or jamming. I recommend regularly checking the coolant's pH level to prevent component corrosion, and having technicians test the opening/closing performance during each service. Always choose OEM-quality parts when replacing components—don't cheap out, as durability varies significantly. If the cooling fan stops working or engine temperature runs too high, the problem may worsen, so timely repairs can save big money. Ultimately, prevention beats repair—this component's failure can easily cause major disruptions.
