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The lower radiator hose is noticably colder because it's a gravity-feed system in addition to circulating via the water pump... Hot coolant comes into the radiator via the upper hose, gets cooled as it flows downward... By the time it reaches the bottom hose to go back into the engine; it is several degrees cooler.
Not sure why anyone would use an Altima thermo instead of an OEM 240 part in this case.
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