I recently installed a dealer air conditioner in my truck, (the '70 F-100) and in the process I had to make some holes to route the lines and heater hoses. The stock holes for the heater hoses would not work, they needed to be lower. Has anyone got an idea how to plug these holes to keep the hot air out, as it kind of defeats the purpose of having an air conditioner to have hot air off the headers coming into the cab. Also, does anyone know what would make a good insulation for the firewall and floor? I'm thinking of putting carpeting in it, and want to keep it well insulated.

Kurt

 

Eastwood company carries something called strip caulk. It's like thin clay strips that you can mold and shape into any shape or size and it doesn't get hard or brittle and it sticks well. That's what I used to seal up the holes in my firewall when I had to drill some holes to run wires and tubing. I also insulated my floor with heat shield that has matting on one side and shiny silver foil on the other then covered it with a new mat.

 

You can get a marine plug. Two brass washers/discs, a rubber plug in the middle about an inch thick,with a nut and bolt running down the middle of everything. Squish the plug into the hole, clamp both washers down, one on each side, and you have a leak tight seal with metal on the engine side so the firewall stays intact.

 

I checked the Eastwood company, and while I believe they probably carry quality products, they want too much for it IMO. I am just a college student, after all!

Rebocardo, that sounds like an excellent idea, for the old radiator hose holes. Where would I get those, a boat shop?

 

If you think Eastwoods is expensive, just wait until you go into any marine store, for anything.

Try getting some fiberglass cloth and epoxy mix. Put some type of stiff screen in place across the hole, cover that that with the cloth and brush on the epoxy mixture, saturating the glass and sticking it to the firewall.