coolant temp gauge

My 2006 Mazda 6 is over heating when I drive and then sit or if I let it sit and idle. There are no leaks that I know of and the temperature goes back down when I turn on the heat. It drives fine other wise. Anyone know what might be the issue?

Hi everyone, I recently purchased a 06 Mazda 6i as second vehicle to commute with and have been having weird issues specifically with the engine coolant gauge and fuel gauge in the instrument cluster. I noticed that when the engine shut off, the needles for both gauges sit well below what I...