I recently purchased a 2000 KLR250. I have completely tuned up the bike including replacing the coolant and it runs great. After about 20-30 minutes of riding the temp guage gets up to the red. It has never "bolied over", but I know it has come close. The fan never kicks on. The fan turns on and runs strong when I ground out the wire, so it isn't the fuse or fan. I assumed it would be the fan/thermo switch and I replaced that, but the fan still won't come on when it gets hot. What is the next thing I need to look at? Thanks in advance for any input!