What are the reasons for a thermostat failure?

1 Answers
AsherDella
07/30/25 5:07am
Here are the reasons for a thermostat failure: 1. Due to prolonged warm-up time, the engine operates at a lower 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 states cause frequent contraction and expansion of the cylinder block, which can lead to adhesive failure or detachment, resulting in diesel engine malfunctions. Additional impacts of a faulty thermostat include: 1. The engine cannot reach its optimal operating temperature; 2. Increased engine wear, shortening the engine's service life; 3. The oil cannot achieve optimal viscosity, increasing engine operating resistance; 4. The engine cannot operate at its normal temperature.
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