It is alleged that Allen Tyler claimed:

My process is quite simple:

1:  Take car to a qualified mechanic
2:  Pay mechanic to replace radiator
3:  Take car home

Done! :)

Just be sure to take the car to a reliable mechanic.  The radiator of
my '03 Mazda 6 sprung a leak about two years ago, coincidentally with
my moving away from the excellent dealership I bought the car from, and
the new place was clueless, I wouldn't trust them to replace my tires.

The radiator was replaced under warrantee.  Once the next-nearest place
found the leak.

Odd thing though, is that it only leaked when cold.  Usually a radiator
leak happens when it's hot.