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What are the symptoms of a faulty coolant temperature sensor?

2 Answers
LeCaroline
07/24/25 1:36pm
The symptoms of a faulty coolant temperature sensor are: 1. The temperature gauge needle does not move and points to the highest position; 2. Difficulty starting the engine when cold, displaying a warm engine temperature signal, causing the ECU to receive no signal for a rich air-fuel mixture and only providing a lean mixture; 3. Increased fuel consumption and unstable idle; 4. Difficulty accelerating, with the engine speed not increasing even when the throttle is fully pressed. A sensor is an electronic component in the car's circuit. If it is damaged, there is little room for repair, and it must be replaced. If you want to test the sensor, a simple method is to place the coolant temperature sensor in a heating cup (be careful not to submerge the connector part) and use the "resistance range" of a multimeter to measure it. As the temperature rises, the resistance should decrease. If there is no change, it indicates that the sensor is faulty.
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SanSimon
08/11/25 7:36am
I remember when the coolant temperature sensor went bad, the car had a lot of issues. First, starting in the morning was particularly difficult, with cold starts being a struggle, and the engine seemed to be laboring. The temperature gauge would also act up, sometimes showing the lowest temperature even when the engine was already hot. The fan could go out of control, either running non-stop or not turning on at all, causing the engine temperature to rise rapidly. Idling became unstable, with the car shaking noticeably when parked. Fuel consumption also increased significantly because the computer wasn’t receiving the correct temperature signal, preventing the fuel injection system from optimizing. Additionally, the warning light on the dashboard would frequently come on, acting as an alert. If not repaired promptly, it could damage the engine, such as overheating and burning out the cylinder head. I recommend getting it checked at a professional repair shop with a diagnostic tool as soon as these issues are noticed—fixing small problems early can save a lot of money.
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