heating problem?

[Toms306]

It could be a leak on the engine side, if theres no water in the matrix it won't heat obviously, doesn't mean its that that's leaking though!! Check the whole cooling system if you can see it, just follow the water pipes its pretty obvious where they go. Also park over a bit of dry cardboard, if nothing appears over night try idling/revving over the card - if nothing still appears, well, cross that bridge when you get there lol.

I assume you've checked the oil to make sure the water isn't going in there lol?