I recently replaced my T-Stat and drained the whole coolant system. Bled and filled per the Bentley manual. About 2-3 weeks after doing so, the coolant level warning came on. I topped it off, thinking that was normal after several heat cycles. After about 2 months, it is low again. I don't think my headgasket is bad and I don't seem to have any coolant leaks. One of my coolant hoses is on it's way out and is wet around the hose clamp, but doesn't seem to leak enough or at all to lower the level that much.

Is it possible it's still due to completely filling the system after the T-Stat change???