Remove the sunroof drain
hose from the front of the sunroof module.
Use a deep socket that fits tightly in the inside diameter of
the drain hose in order to connect the bottom of the new drain hose with the
top of the old drain hose at the windshield A-pillar.
Work the drain hose back
and forth in order to loosen the sealer.
Pull the sunroof drain hose grommet from the hole at the A-pillar.
Pull the old sunroof drain hose out through the bottom.
Ensure that the new drain hose is routed correctly in place.