[mpumas]

During hot weather, it is normal for the fan to kick on when you turn the engine off. It should run for a couple minutes and then turn off. There should not be any fluid from the radiator unless the pressure cap is weak or the overflow tank is overfilled or for some reason the hose to the overflow tank from the radiator came loose or sprung a leak. You need to find out where the fluid is coming from. As for the thermostat, if it were a problem, it would show up when driving the car. It would not reach temperature if it was stuck open or would overheat if it were stuck closed.