I am having to top up my cooling system often and have had pressure test carried out and checked for leaks which shows no loss of pressure, but when running the engine with expansion cap off water appears to be running from the small pipe connecting to the top of the expansion tank, I thought this pipe was the overflow am I wrong in my assumption? Can anyone tell me where this pipe connects to and is it normal for this to happen. P.S. This problem has caused me many sleepless nights and would appreciate any help to solve it. Incidently I returned home yesterday on the back of an AA recovery truck because after travelling approx. 50 miles my temperature gauge went of the scale. The vehicle is a Galaxy 1.9 Tdi Ghia 2000 W Reg. Thanks for any help. :)