[carmine]

I just experienced the exact same problem with my fan, would not come on at temp. Replaced the rad fan switch and relay and still not working. turns out my thermostat was stuck in closed position. You see if the radiator dosn,t have hot fluid running through it in order to activate the bi-metal fan switch, your fans won,t activate. Its the thermostats job to open and let hot fluid run through the rad. If it dosn,t open the rad stays cool and the engine gets hot.