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The only way the fan could impact the radiator's seal is if it were out of balance or loose and caused vibration. Plastic tank radiators commonly fail around 120k miles anyway because the plastic gets brittle from the heat.
Just wanted to check on that. Installed the new radiator so it's done, but haven't had the time to push the car so I will update if I find anything later on the week. Might make it to rr-racing open house and see if any leaks. Coolant was on the low side so I added some in yesterday.