Hi to all, I'm at my wits end - I've got a 2002 Peugeot Expert van, and it's not playing ball.

It drives sweet as a nut, and in my line of work, it's regularly left running for 8 -10 hours at a time, which it's fine with, but when used on a motorway run it's blowing it's coolant out of the expansion bottle over the course of the journey. There's no sign of the van running hot, it's had it's thermostat replaced as a precaution, it's had the bottle cap replaced twice (second one stopped holding a vaccum within a day).

Three mechanics have looked at it, and none have managed to find a fault - it's been pressure tested, it's had some dye gubbins put in it which shows up compression leaks or sommat, and it passed that test. I keep saying change the head gasket, but nobody's listening to me, as all the mechanics are convinced it's not the head gasket. In your experience, is there anything else this could be?

on a second question, is there much difference on this hard-to-reach engine between doing the head and swapping the engine for one with half the mileage on it? Is there an easier, less time consuming way to access the head without having to drop the engine?

Thanks

PG