Oldsmobile/Buick Repair: Cooling system, head gasket, water pump

Question
I have had a issue with the coolent level being low.  I replace the fluid and in a week it is low agian.  I see no steam or fuild leaking.  Is this the sign of a failing water pump of Thermastat.  Thanks

Answer
hi tim, well not a t stat.but possibly a water pump or some type of leak   hoses head gasket radiator. you should prob go and have a cooling system check ,this will tell you exactly where it is going..please don,t forget to rate my service ty billymac