I just put a fan on my 2001 400 exc. All seems to be well but the fan doesn't come on. The weather is cool (about 65). I crank it up and let it run for about 3-4 minutes (don't have the guts to go longer) with it sitting still... But no fan (or boil over). I can jump the 2 wires at the thermostat switch and it comes on. Should it come on and how can I check it out without toasting my motor if it's not working?