Steve,
There is a bypass hose on the thermostat housing that allows water to pass
directly to the water pump and back through the engine. If this hose were
blocked, it would probably produce the symptoms you describe. The
temperature would build up, but since the water isn't flowing, the
thermostat wouldn't open until much later than it should. It could also be a
half dozen other things, but this is probably worth adding to the list of
things to check.
Good luck,
Bob Palmer
rpalmer@ucsd.edu
rpalmerbob@adelphia.net
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