What is the reason for the normal temperature gauge but the red light is on?
1 Answers
The normal temperature gauge but the red light is on is caused by a false alarm of the temperature warning light. When the owner adds antifreeze, due to the excessively low position of the vent hole on the side of the reservoir damping tube, a compressed air column forms in the damping tube, causing the liquid level in the damping tube to be much lower than that in the expansion tank and near the sensor alarm point. The vibration during driving can easily trigger a false alarm. Here is some information about the temperature gauge: Normal temperature: The temperature gauge shows the coolant temperature, typically displaying 70-90 degrees after the engine warms up, which is normal. When the water level in the coolant tank is low, the temperature will rise, and water needs to be added. If the temperature gauge approaches the H or the red danger zone, and the temperature warning light comes on in severe cases, it indicates that the engine coolant temperature is too high. Working principle: The sensor of the temperature gauge is a thermistor-type sensor, fixed with threads on the engine coolant passage. The thermistor determines the current flowing through the coil winding of the temperature gauge, thereby driving the pointer to swing.
