Losing coolant/water rapidly

[OneScotty2Hotty]

Hello, my 1.4TDI seems to be losing water from the coolant tank rapidly. For example the low water light bleeps on the dash and so i fill the tank up to "max" then within 2 days the light comes back on and the water is below minimum. I have taken it to a garage where the system was pressurised and it came back fine!? What could it be?

Please help

 

[spike]

If there are no obvious coolant leaks and the water pump seal is not weeping then I,m sorry to say the most likely cause is a faulty headgasket. Other members who reported similar problems found that in the early stages, the cooling system did not pressurise and blow the water out of the pressure cap overflow until the engine was worked hard. Gentle cruising under 60 mph obviously did not develop enough cylinder pressure to leak past the headgasket into the coolant galleries. The garage pressure test would not highlight anything either, until the gasket delaminates further and the leak gets worse

Cheers Spike