I am having the same problems. I have the parts but need a weekend to get this done.

Heater HOSE = $9 from Part Source 5'8"
1" Metal hose clamps from Part Source $1 each x3
Brass T fitting from HOME depot in the plumbing section $$1.50

I noticed there are two "Y" connectors back there and I may just replace both while I'm at it. This single fix that is a PITA in many year model designs is DISGUSTING!!!

But hey....keeps the dealership shops busy for those that have the $$$ to burn.