Ok, so i changed my coolant a week ago. After 2 days of driving it, i started noticing the temperature gauge go up but not all the way up..maybe 3/4 of the way. i had my heater on and as it went up, the heater shut off. so i slid the heater thing to off and drove a few seconds until the gauge went back to the middle. after i got home i added a little water into the radiator because i dont think i added enough during the change. so after a few days of driving, didnt notice the temp gauge going up until lastnight. i dont know what's going on with my car.

can anyone help? should i re-do the coolant change?

thanks guys