What is the reason for the thermostat not opening?

[ArcherAnn]

The reasons why the thermostat does not open: The thermostat cannot open after being damaged, which is the most common and severe situation; The water temperature is too low, and the thermostat cannot open because the temperature does not reach the opening threshold, which is also relatively common; Prolonged disuse leading to rust and adhesion, which is less common. Below are the relevant details: 1. The function of the thermostat: It 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. Maintenance status: The thermostat must maintain good technical condition, otherwise it will severely affect the normal operation of the engine. For example, if the main valve of the thermostat opens too late, it will cause the engine to overheat; if the main valve opens too early, it will prolong the engine's warm-up time, resulting in the engine temperature being too low.