"always a hiss when open – always left to cool. "
Uh-oh...sounds like a HG problem to me. Mind you, my BX TD went for 70k miles like this before I changed the gasket. If the rad is leaking run your hand along the bottom of it, and it will probably look blue (assuming you are using blue antifreeze [:p]). The red stuff might be some instant gasket that has escaped from a previous repair.
Keep an eye on it, but I suspect you may be getting accquatined with the inside of the engine before too long [xx(]
Temperature shot to 110
Moderator: RichardW