Sounds like a blown head gasket or cracked head, either letting
combustion gases into the cooling system. The combustion gases are 1000s
of psi so it takes only a tiny and brief breech for a small gas bubble
to get through and then expand in the much lower pressure cooling
system. The fact that coolant doesn't yet leak the other way doesn't
matter to this possible diagnosis as that takes a larger problem.

When you say your temp led doesn't work do you mean it doesn't blink a
few times every time you turn on the key?

Mark

Don Hanson wrote:
>    Hi all, recently I've noticed my cooling system is being weird.
>    Don Hanson
>