Porsche 996 water leak

[Jack1964Shaun]

Hello everyone , can any one help me . I have water leaking out of my 996 C2S from the rear of the car . It only seems to do this when it's ticking over to get it up to temperature . There is no oil in the water . Anyone had a similar problem and what was your solution . It's a 1998 , apart from this then I have no other problems with the car

[Beety]

Probably the expansion tank, they crack when they get old
Can do it DIY but it is a pain !