Car problem

The first thing to do is get a coolant pressure check done. Most automotive stores will do a compression check, This will tell if there are other problems. If you are filling it once a day do you see any fluid on the ground after you run it and it sits? If it's leaking by the thermastat most times it is the hose. The thermastat will run about 5.00 and the housing around 7.00 and up.