well if it is ur head gasket then u would b losing power when driving like when u 2st start off and it would b blowing alot of white smoke how long did u run it when it was overheating and if u ever put cold or room temp water in ur reservoir u should keep the car running cuz it might crack ur block or head that wouldnt be good but with this car there r sooo many heater hoses and i would fill up the reservoir and on or in a dry place just run the car see if u can find a place where it is leaking water if there is no smoke and alot of smoke then i dont think ur motor would b burning up all of ur water it might just b a leacking hose but i cant just tell u what would b wrong with it another cheap fix would b ur thermostat dose ur heater blow hot or cold air when car is getting hot