[olddog]

I re-read your first post. Origonally it ran cool down the road, but got hot at an idle. This would mean that at an idle you are either not getting enough liquid flow or not enough air flow.

If the problem is not enough liquid flow and you have plenty of air flow, then you should be able to rev the engine up to highway rpm and the engine temp would drop to normal. If it gets hotter, then the problem is lack of air flow.