What are the reasons why a new thermostat won't open?

[EliasDella]

The reasons why a new thermostat won't open are: 1. The water temperature is not high enough; 2. The water passage is blocked; 3. The radiator is frozen. When the thermostat is closed and cannot open, the engine temperature becomes too high, which may cause the engine to stall due to overheating. Additionally, since the thermostat is closed, it cuts off the radiator system, preventing the excessively hot and high-pressure water from being forced into the water tank by opening the radiator cap. This could potentially damage the water jacket in the small circulation system. The thermostat automatically adjusts the amount of water entering the radiator based on the coolant temperature, changing the water circulation range to regulate the cooling system's heat dissipation capacity, ensuring the engine operates within the appropriate temperature range.