i'm guessing that the fins between the tubes have corroded and are not really doing anything.
i had this on a street honda and it was running hot at 70 mph whenever the a/c would be on. i thought the bugs and leaves were plugging off the air flow.
i tried to hose it off with a garden hose (just a very slow stream, no pinched nozzle, just an open hose) and the first thing i got wet, stuff just fell out of the radiator. i then touched/pushed with my finger on places where i had not touched it with the water and stuff fell out there too.
if your honda had seen any road miles in the rust belt in its first life, you might have the same thing.
take a very close look at this and see if anything falls off yours. i am thinking if you go after thermostat, etc., you might be chasing the wrong issue.
tom
1985 CRX Si competed in Solo II: AS, CS, DS, GS
1986 CRX Si competed in: SCCA Solo II CSP, SCCA ITA, SCCA ITB, NASA H5
1988 CRX Si competed in ITA & STL
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