My 2001 Ford F250 Radiator has a leak! I filled it up with water and it went low again. It over heated I then put antifreeze at the autoparts store after it got hot then it was still running warm and I drove it home and parked it! Someone tell me what I should do know?

If you are sure it's the radiator that is leaking, I would install a new radiator. Afterwards, refill it with a 50/50 mixture of distilled water and the recommended antifreeze. Add the necessary amount of SCA to prevent damage from cavitation. Pressure leak test the system, if you are unsure of where the leak is.