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radiator
Radiators--left sitting or used regularly need not only to be flushed, but also "rodded out." I use a radiator shop to do the latter task. Makes a difference in coolant flowing smoothly through the passages.
Another way to check for adequate flow is this: Remove radiator car: with a good light, look down into the rad and carefully examine the small series of openings through which the coolant flows; if you see rust or sludge accumulation or clogging, it is a pretty good indication that the rad needs rodding out.
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