What are the reasons for the thermostat not opening?

[SanStephen]

Here are the reasons why the thermostat may not open: 1. Internal damage to the thermostat or damage to the thermostat opening valve; 2. Blockage in the water passage; 3. Frozen radiator; 4. Water temperature is too low. Below is more information about the thermostat: 1. The thermostat automatically adjusts the amount of water entering the radiator based on the temperature of the coolant, changing the circulation range of the water to regulate the cooling system's heat dissipation capacity, ensuring the engine operates within the appropriate temperature range. The thermostat must maintain good technical condition; otherwise, it will severely affect the normal operation of the engine. 2. The function of the thermostat is to prevent the engine from becoming too cold. The main type of thermostat used is the wax-type thermostat. When the cooling temperature is below the specified value, the refined paraffin in the thermostat's temperature-sensing body remains solid, and the thermostat valve closes the passage between the engine and the radiator under the action of the spring. The coolant returns to the engine via the water pump, performing a small circulation within the engine.