Temp Gauge stays above half
 

Can someone please explain to me why my temperature reads like this???

Clogged system, water pump not working well.

When was your last full system flush?

I don't think the temperature gauge keeps reading when the car isn't running, but I could be wrong.

GM had an issue with the stepper motors they used in their instrument clusters. It was a very common speedometer issue but I have seen other gauges with the same issue.