TUNERS, THE TEMP GAUGE ON MY CIVIC GOES UP AND THEN COMES BACK DOWN TO HALF, THE RADIATOR HAS COOLANT AND THE OVERFLOW BOTTLE IS NOT OVERFILLING, THERE'S ALSO NO COOLANT/WATER IN THE OIL, OIL LOOKS GOOD. THIS STARTED HAPPENING RECENTLY AND NOW MORE FREQUENTLY, WHILE DRIVING THE GAUGE WOULD GRADUALLY...