There is a myth that is quite popular in some countries with hot climate, even among mechanics; "cooling system's thermostat is not needed in the car".
This believe is not necessarily true even though the importance of the thermostat is not as much as it is in a car in a cold climate.
Some of the effects of thermostat delete;
The engine does not warm up on time. One function of the thermostat is preventing the coolant from circulation until the engine has attained a particular temperature. When the thermostat is not in place, the coolant begins to circulate right from the moment the engine is started. This extends the time the engine takes to attain operating temperature. The cooler the ambient temperature, the more time it will take to attain operating temperature.