it wudnt be the same sir, thermostat regulates water flow between the engine and the radiator, to make sure temperature is kept at its optimum level. the fan is there to cool the radiator when the car is stationary. in the end, u still need a thermostat, no matter what climate u r inwell u could try this as well, run ur fan on automatic...as in when the water temp hot than only the fan on... this also works out to be the same... but not to exactly how a thermostat works...