Originally Posted by
Chris Bebs
I've bin told on the v6 engines when the head gaskets gone your water will bubble the odd bubble is normal but when it bubbles constantly then that's the air escaping
The gasket blows in such a way that it doesn't affect the oil, or water ways, so 'normal' diagnosis isn't relevant. When I broke my ST200 I took the heads off to check as I'd had the 'tick' for months. Sure enough there was a tell tale 'scorch mark' where the gasket had gone.
Not saying that's what you've got - but just google 'Mondeo V6 head gasket' and you can see the amount of people who have had the issue.