The temperature gauge is one of the most important pieces of information on your car's dashboard. It tells you how hot your engine is running, and if it starts to climb too high, it can be a sign that something is wrong. There are a few different things that could cause your temperature gauge to fluctuate, and it's important to figure out what the root cause is so you can fix it.
One possibility is that there is an issue with the coolant level in your engine. If the coolant gets low, it won't be able to do its job properly and the engine will start to overheat. You should check the coolant level regularly and top it off if necessary.
Another possibility is a problem with the thermostat. The thermostat controls how much coolant flows through the engine, and if it's not working correctly then the engine can get too hot or too cold. This will cause the temperature gauge to fluctuate as well. You'll need to have a mechanic take a look at this to see if it needs to be replaced.
Finally, there could just be an issue with the sensor that reads the engine temperature. This isn't as common, but it can happen from time to time. If this is happening then you'll need to have someone readjust or replace the sensor so that it's giving accurate information again.
If your temperature gauge starts climbing higher than normal, pull over immediately and turn off the engine. Then call for roadside assistance or a tow truck so you can get your car looked at before any serious damage occurs.