Remove the sunroof module from the drain hose connection.
Drain the hose from the sunroof module.
Cut the drain hose half way up the windshield pillar.
Connect the bottom of the new drain hose with the top of the old
drain hose, at the windshield pillar. Take a standard sock that fits tightly
in the inside diameter of the drain hose.
Loosen the sealer by working the hose back and forth.
Pull the old hose out through the bottom, the new hose should
then be routed correctly.