A few months bk I was loosing coolant, I found the leaking pipe (crack pipe to oil cooler) and replaced it along with a metal crack pipe but i still seem to be loosen coolant When I got home from work today i had a look under the bonnet to see if there were any immediate signs of leakage which there were none. I felt the upper n lower pipes that go to the rad n both were rock solid, I then noticed the exp tank was showin empty (I filled it up this morn), I undone the tank and the level shot bk up to max To me this seem wrong?? What prob do I have? All help appreciated Thanks