Folks,

Have tracked excessive lose of coolant (1L/week) to the overflow pipe on the coolant tank. Any idea's on what can be causing the coolant to take this route ???. Should I plug overflow pipe to retain water ??

I have already changed the tank.

Much appreciated.

John McMackin, January 2013

Pressure in the header tank usually comes from head gasket or water pump issues.You could try flushing rad and system and retrying.Don't block overflow or you will burst something with the pressure build up

Steve, January 2013