So I've been using 5873 for a daily driver now for nearly 2 months, and drives just fine, but within the past week or so I've been noticing the temperature gauge is rising up higher than it has ever before, on the hottest days in the past with the AC going on my gauge it would never go past the first quarter mark, but each day I've been driving now it has made its way slowly to the half way point on the gauge. I've check fluids and everything looks ok, but its been probably 10,000 miles since last coolant flush which was over a year ago. Any suggestions? And on another note even when the engine is off and cold the lowest the gauge falls is in between the very first mark and the quarter mark. Thanks brandon