water coming out of top of expansion tank

[Nadine]

So i have done a search and i think i found the answer but wanted to ask as my symptoms are a little bit different. So i have no water in the oil, and no oil in the water, car does not over heat and fans kick in when they should. However when ever i top the car up with water and then leave her to run when i switch her off once she has reached temp, water starts to piss out of the top of the expansion tank. It doesnt come out the overflow pipe, just the top of the tank. Now in my search people were suggestion its the rad cap? is this right?

[jammapic]

Either rad cap, as a cheap fix. Or, possibly the headgasket has gone between the cylinder and water jacket and is pressuring the cooling system beyond the 14psi it's supposed to be.

Easy to check, stick a new rad cap on. If it still does it, HG.

JP

[Nadine]

perfect, ive ordered a new rad cap come on wednesday. i shall try it and see what happens