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Re: random overheating
Unless there is a huge build-up of sludge or rust on the impeller, which is not likely, water pumps do not "fail" to pump water. The only thing that can really happen is bearing failure (which makes noise) and seal failure (which causes a leak). Water pumps just don't miraculously quit pumping.
They are not "positive displacement" pumps, like an oil pump. It is simply a "propeller" that is in the water and "suggesting" that it should move.
As far as checking for the amount of cores. You simply look through the radiator cap hole. You should see the ends of the cores, if you can't see them, that is part of your over-heating problem.
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Quote:
Originally Posted by Longhorn Man
As for reading directions...
The directions are nothing but another man's opinion.
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Learn from the mistakes of others, you won't live long enough to make them all yourself...
Bad planning on your part does not necessarily constitute an instant emergency on my part....
The great thing about being a pessimist is that you are either pleasantly surprised or right. 
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