I have a 96 civic
It was a pretty hot day yesterday. I ran the car for about half hour, went into a store and came out as I was idling I noticed the temp gauge going up to about 3/4, not in the red zone. Typically it never goes that high, as I started to drive it came back down. I parked again and sat there, as it hit about 3/4 again the fan kicked on to bring down the temp.
This morning I added a little coolant and the overfill tank has plenty of coolant, no noticeable leaks under the car.
Question can it be the thermostat, or if the thermostat is bad will just overheat?
Any other ideas?