Trying to over heat
3 Answers
If just the reservoir is low it would not make your car run hot but you should fill it up to the "cold" line when the engine is cool or the "hot" line when the engine is warm.
Ok, it didn't run hot, but temp gauge went past the halfway point where it usually runs. So could it be because of low level????
Top off the coolant and see. Purge air out of the system if the problem continues. http://www.instructables.com/id/How-to-Burp-your-cars-cooling-system/