Engine water leaking from header tank?

[nicknak2010]

Ello lads

Pretty simple one clio 172 2002

Noticed my water leaks out of the top of my water header tank, just wondering if it should leak (asin under pressure should it let the water out) or should it not let a drop out at all

The top has the rubber seal in place but water leaks out i guess when driving as its not visible whilst car is just running.

 

[charltjr]

No, it shouldn't leak, sounds like you need a new expansion tank cap.