What Causes the Thermostat to Fail to Open?

[CamillaLynn]

The reasons why the thermostat fails to open: 1. The thermostat is damaged and cannot open, which is the most common and serious issue; 2. The coolant temperature is too low to reach the opening temperature, leading to failure to open, which is also relatively common; 3. Prolonged disuse causes rust and sticking, though this is less frequent. Here are the relevant details: Function of the thermostat: It automatically adjusts the amount of coolant entering the radiator based on the coolant temperature, altering the circulation range to regulate the cooling system's capacity, ensuring the engine operates within the appropriate temperature range. Maintenance status: The thermostat must be kept in good technical condition; otherwise, it will severely affect the engine's normal operation. For example, if the main valve opens too late, it can cause engine overheating; if it opens too early, the engine's warm-up time will be prolonged, resulting in the engine temperature being too low.