Right. There's a bleed hole on the fill (overflow) tank behind license plate?
If the valve on expansion tank blue cap is failing or failed open, it
allows a clear path of
coolant into the fill (overflow) tank?

Something I've been meaning to purchase: cooling system pressure tester.
Would suggest to the OP that this is a wise investment if not already on hand.

Neil.

On 3/30/16, Jim Felder <jim.felder@gmail.com> wrote:

> Also if no one has mentioned it yet, be sure to check your overflow tank.
> If coolant spills out when you open it, it's coming out when you are
> driving and you don't know it. Replace the cap.

--
Neil n

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