What is the solution for false high temperature in cars?
2 Answers
False high temperature in cars can be resolved by replacing the thermostat. False high temperature refers to a situation where the coolant temperature is not high, but the gauge indicates a high temperature. The function of the thermostat is to automatically adjust 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 an 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 there is no flow, it indicates that the thermostat is damaged or there is debris stuck between the main valve switches. 2. After starting the engine, feel the upper and lower radiator hoses. If their temperatures are the same, it means the thermostat is damaged.
I remember driving for decades and encountering false overheating several times, meaning the dashboard temperature gauge spikes high, but the engine hood doesn't feel hot, which can be quite alarming. This is usually caused by a loose or dirty temperature sensor connector, misleading the gauge display. The solution is to first find a safe place to stop and turn off the engine, then open the hood to check the coolant level—it should be between the MIN and MAX lines; if it's low, top it up with coolant. Next, inspect the fuse box, locate the fuse related to the coolant temperature sensor, and replace it if it's blown. Also, check the sensor itself, typically located at the front of the engine, and clean any dust or oxidation from the connector. After handling it this way myself, the issue was resolved. However, it's important not to overlook real hazards while dealing with false overheating—such as actual engine overheating, which can be dangerous. So, if you can't fix it yourself, head to the repair shop immediately. Regular maintenance, including cleaning the sensor, can prevent such issues in advance.
