Replacement Heater Blower Hose
Those hoses on the sides of your heater that go up to your defrost vents are expensive $$$. Here is one low cost suggestion taken from the CCOT Site:
"I used a 2 1/2" defroster hose from CarQuest. Mighty Flow, #
96004.(also had this number on package DORMAN 708-085. This hose fit right on
both the heater & top duct, sort of screws on. I did both sides and had some
left over."