So, I've taken the blower motor, evaporator core, heater core, and their housings out of my truck. I stripped all the old padding and weatherstripping out of the boxes. I don't think it's really weatherstripping, but I don't know what to call it. Now that everything is cleaned and ready to go back together, I need to replace that padding and other insulation type of stuff.

I haven't found any of the original type of material to go around the heater core or the evaporator so I did some thinking while wandering around the auto stores.

Tell me what you guys think - I know y'all are kings of modification!

To go around the heater core:
Get a roll of metal tape and wrap the outside edges of that sucker. Or, I could use gasket material and use some high temp adhesive to stick it to the outside of the core. All this to increase efficiency and ensure the air flows through the core and not out of the top or bottom.

For the places where the boxes fit together, use regular weather stripping cut to fit.

For the doors inside of the boxes, use the same weatherstripping but in some cases, like the blower box - double and triple it up to get the same height as the padding that came off the doors.

For the evaporator core box, there was a liner inside. I suppose this was to control moisture and keep the outside of the box from having condensation form. I can take some 1/16 gasket paper and some super tack to make a new liner. Where the pieces join at the edges and could use some silicone.

What do you guys think? Sound like it should work ok?