Hello all, nice forms ya guys got here i've been comin here for a while now. Anyway a buddy of mine has a prob with his Fan on his bigbear 400 the problem is he can run it for 2 maybe 3 hours and the fan never kicks on to cool down the engine we rode it yesterday for hours and the motor got so hot we had to just park it and let it cool befor we came home, i tole him that i would see what i could do but i dont know where to look at on the motor to check the thermostat i told him it might also need a knew one, the fan works because i hooked it up to a 9v battery and it cuts and runs???