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hi
I have a 2001 Mitsubishi gallant es 4 cylinder model. Lately I have noticed an issue with my cooling system. Not sure if this is an issue but here goes the detail
I start my car. the temp control is below cold as I am driving my car my the temp control rises up and hits the halfway mark .the cooling fan starts off. The cooling process is started after 2-3 min the temp control goes a little above the half way mark more like 52-53% it stays there for a minute or two and then drops to 50% and then 48% and then stays there for the whole time. This happens every time I start the car and there is sufficient interval for the car to cool a little between subsequent starts.
I noticed my reserve coolant white box was empty so i put in prestone 50-50 ready to use any color mix in the reserve and drove it for some time and then noticed that the radiator had sucked some coolant an the level had gone 10% down n the coolant reserve box. The above thing still happens though even after topping the coolant
Firstly is this an issue? Or normal behavior and if it is an issue what could it be
Any help will be greatly appreciated  

sounds like maybe a bad head gasket.  

the half way mark on the temperature gauge is normal operating temperature, if it is going into the 80% to 100% range then you are overheating. if you are constantly adding coolant then you have a leak somewhere. if not then everything is operating normally.