I wouldn't condemn the 4 row radiator just because you got a leak after 5 years. Anything can leak in that amount of time.......could even be a core defect or workmanship issue. I'd pull it out and take it to a radiator shop. I'm guessing they can fix it up for around $150 or less. If your van is a daily driver, maybe you could call them ahead of time to set up an appointment to have it fixed while you wait. FYI, I've been running my 4 core radiator for around 10 years now with no issues (knock on wood). Tim