i think the radiator issue has to do with frequent/prolonged hard driving.
my friend with an 98 acura 2.3cl had leaked his radiator within 5 months of having his car [used]. he redlined frequently on a daily basis. [probably 5 times a day]
during the time when the radiator was getting fixed, he drove the honda oddessey [the minivan]..... and within the 2 weeks he had the car.... boom another radiator problem. he also redlined this vehicle frequently.