header/ expansion tank and water loss

[jonnyRT]

if the cap is fooked will this cause a water loss due to incorrect pressure ?

i also noticed a small crack which is never wet but could i still be loosing water fom it?

i can hear a hissing noise after i have been driving from the header tank so its loosing pressure and causing water loss?

really confused as nowhere is obviously wet but the waters going down quite a lot, no mayonase in oil cap or smoke just normal water vapour from the exhaust

HELP!

 

[jonnyRT]

anyone?

 

[edde]

Sounds like you need a new header tank it will only leak out when hot.

A badly sealing cap will cause the problem though your right.

 

[jonnyRT]

ill change the tank and cap and see if it stops

thanks,JB