So I start my car early in the morning and I hear a burbuling sound coming from the center of my dash. I give the car some gas and it just sounds like water is gushing out. I checked the carpeting and it's dry. I look under the car no coolant puddle. I replaced the Radiator cap the next day after I bought the car (last saturday). Every four days to a whole week I have to ad water to the car. Not blowing out any white smoke:ugh2: Oh yeah once it reaches operating temps it goes away. Heater works fine b the way. Any help or tips are greatly appreciated.