Having dramas with disappearing coolant from my 914 , changed every hose replaced the clamps with the spring type , then don a 14 hr trip , all good , flew up to tilpa from echuca, about 2.5 hrs , bottle empty, filled it up , came home this morning, 3.5 hrs , headwinds, bottle empty, driving me nuts, is there a chance it’s leaking past the water pump seal, not a easy fix, read somewhere it can leak in the cold weather, can’t see any visible signs, anyone come across this?