Is an Aluminum or Plastic Thermostat Housing More Suitable for Cars?

[Stuart]

Both aluminum and plastic thermostat housings are suitable for cars. The thermostat is a valve that controls the flow path of the coolant. It 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 and ensure the engine operates within the appropriate temperature range. Methods to determine if the thermostat is damaged include: 1. After starting the engine, open the filler cap of the coolant reservoir and observe if there is any water flow inside. If not, it indicates the thermostat is damaged or debris is stuck between the main valve's opening and closing mechanism. 2. After starting the engine, feel the upper and lower radiator hoses. If they are at the same temperature, it means the thermostat is damaged.