Okay, I'm driving along and everything's fine temperature-wise. I get to the drive-thru, order my food, and pull up behind the car at the window. Still, everything's fine. I put the car in Park, look down to get a tape and to fast-forward, etc., and when I look up, the temperature gauge is all the way over to H. Of course, I freak out (having overheated and cracked the engine block before, I'm not too happy to see this), turn off the engine, pop the hood. There's plenty of fluid in the reservoir, and the engine isn't even radiating any heat (it's a pretty short drive over to the fast food joint). Against my better judgement, I decide to turn on the car and move it out of the line so it can cool down. When I turn it on , it's back to normal. Everything's the way it should be. So, I drive home and decide to try an experiment. I leave it running and put it in Park. Within seconds, the needle's climbing again. I'm about to go out and check the fluid with a flashlight, but I really think it's cool. I'm then going to crank it and run it in Drive to see what happens. Assuming it stays at the normal level, what's going on? Problem with the gauge? Maybe the fan doesn't run in Park? I hope someone can help, because I'm really worried over here.