My '06 GL1800 shows a constant mid-range temp reading almost all the time. However, when I head uphill for any length of time, the temp rises, too. I also rode at parade speed for about ten miles and the temp went up then, too. I put on a belly pan at somebody's suggestion, but temp will rise, anyway under both conditions. I always keep it topped off with only Honda Coolant. The fans turn on and off, but even in the cool mountains, it will heat up excessively. Any suggestions out there?