On my favorite theory of working from easy to hard,
I would check the hose first. Sometimes the spring, that keeps
the lower hose from sucking shut, can break. Or chunks of the
inside of the hose can come loose. The weird thing is the temp gage,
but what I have seen is under low flow, (like the hose sucked shut)
you get cavitation of the pump and local hot spots near where all the
heat is at, then under lower speed (during your cool down part of the ride)
the pump has a hard time starting to pump again due to the
flow disruption and boiling at other areas, meanwhile, the coolant
hanging out near the sensor is normal temp. I havnt seen this on a
roadster, since mine is still strewn all over the garage,
but have seen it on one or two other vehicles.
Good Luck, let the list know what it was!
Jim
67 pushrod 2liter
Chesapeake Va
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