What symptoms are likely to occur when the engine thermostat is faulty?

[Gabriela]

When the engine thermostat is faulty, the following symptoms are likely to occur: 1. The thermostat fails to open, the temperature gauge displays in the high-temperature zone, the radiator fan does not operate, and the engine temperature rises; 2. The thermostat does not close, the water temperature rises slowly, and during winter, the water temperature remains in the low-temperature zone even after 10 to 20 minutes, with high idle speed. The reasons for a faulty engine thermostat include: 1. Extended warm-up time, operation of the vehicle at low water temperature, leading to the formation of acidic substances from combustion gases and condensed water on the cylinder walls, corroding 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, resulting in wear of cylinder liners and piston components; 3. Defects in the cylinder block repaired with adhesive, excessive temperature fluctuations causing frequent contraction and expansion of the cylinder block, leading to adhesive failure and diesel engine malfunctions.