keep and eye on it ... it shouldn't be spiking at all ... try parking the truck on ramps to get the air out ...
keep an eye on it ...
on a 97, I'd be just waiting for the lower intake gasket to go.
if still spiking, you might try a Prestone reverse flush kit and flush the hell out of it some more ... there still might be small obstructions of gunk that get stuck in the heater core ... Presonte also sells an acid flush which is great ...
small cracks in the rad itself on the upper neck are common too.
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Originally Posted by Ben D
Thanks to all for the help. Yes, the coolant was at the top of the radiator. It appears that the radiator cap was the cure. It is still spiking but far less extreme. I'm guessing that there is still air to be removed. It would start happening as soon as the engine reached about 150 deg. on the gauge. Before the cap change the temp would go from (read) 150 to over 200 in ten to thirty seconds, it varied, and drop just as fast when it felt like it. Not sure exactly what was being seen by temp. sensor as I can't see things heating or cooling that fast and heat transfer shouldn't let something local change and be read that fast. Anyway, the cap seems to have been the cure and I'll let you know if anything changes.
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