Q: Temperature gauge goes up when driving and down when not

你好。这表明您可能有一个faulty coolant fan relay switch。这是一个触发的继电器冷却迷to come on at predetermined temperatures. When this is not working properly, this can cause the fans to come on intermittently, all the time, or not at all. When they do not come on at all, this will cause the motor to get hot, especially while sitting at a stop since there is no air flowing past the radiator or engine. As you speed up, the air from the speed of the wind will cool it down slightly which is what you notice when your gauge drops. I would recommend having an expert from YourMechanic come to your home to诊断过热问题并让您知道需要修理什么。