Head gasket?
 

So guy yesterday I installed a thermostat in my truck since some one removed it before me. Do I have always been loosening a lil water but whoa. Now soon as I start it it will puts water out of the over flow non stop so I removed it again not doing it now but still loosing water. So what u guys think head gasket ?

Sounds like somebody tried hiding a problem on you. Start by making sure the radiator cap is good. If no external leaks are present and youre still losing coolant, youre probably burning it.

do u know where your loosing it? any streaks running down the side of the motor? white smoke? pressurizing the cooling system?