How do I fix a transmission line leaking at the radiator connection on a 1997 Astro AWD?

The transmission lineÊleaking at the radiator connection needs to be fix immediately as soon as the driver experience this, isolating the source of leak to avoid major problems. If the leak is found this has to be covered with the finger to avoid further leakage, for repair it needs to tighten the pan bolts, and replacing the output seal.