X350 A/C water leak

Last nite I discovered water leaking out of the right heater duct
onto the floor. I’m assuming the drain hose has dirt in it. Found
out it empties onto the top of the tranny. How can this be cleared?

Local stealer wants to drop the dash, $1K+!! Gotta be an easier
way…I hope.

Roger
05 Zircon X350