A/C & Heater seal on firewall

[joshp717]

Hey, i'm looking for the rubber seal that is between the heater box and the firewall. I've checked a few parts stores in town with no luck...Any of you know where to get one?

Also, i would like to replace the foam seal between dash and blower box...Anyone know where i can find one of these?

[grabbergreen84]

Now there's a couple of obscure parts...

For the big rubber one, I'd check with the dealer.

You can always scour the salvage yards for a really decent original.

[wraithracing]

The large seal for the firewall that the evap core lines and heater core lines go through, just sold on Ebay for over $100.00.

It was NOS for 87 + Mustangs

If you are lucky you might find one through the dealers, but odds are you will have to find one at a junk yard.

I have used regular strip weatherstripping from Home Depot to replace the seal from the unit to the duct work and that has worked well and it's cheap too!

Best of Luck!

Trey

[arj]

I have used regular strip weatherstripping from Home Depot to replace the seal from the unit to the duct work and that has worked well and it's cheap too!

I agree. A roll of universal foam weatherstripping with the adhesive backing will be cheap and will work fine.

But as far as the firewall seal goes, I bet it would be really hard to find a nice one in a junkyard. Depending on the availability and price of a new one, it might be best to use the old seal as a pattern, and just make one. You could try checking with local upholstery shops, to see if they have gray or black closed-cell foam.

[joshp717]

Thanks guys...I'm going to home depot today!

[306gt]

P.M. Hissing Cobra. He made a new seal for the firewall and it looks just like the factory one. Nice and clean. He can tell you the details.

[Hissing Cobra]

I'm just seeing this thread for the first time and I know that you need an entire seal unit. My method may not work for you but here goes.

Two years ago, I changed my '79 air conditioning parts over to the '87-'93 style and had to figure out a way to fix/modify my original seal because the evaporator core tubes protruded horizontally (side by side) as they came out of the firewall. The '87-'93 style has these tubes in a vertical style, so it was a whole new ballgame.

I had to trim the parts of my original foam that protruded into the engine compartment so that the original seal was flat, with nothing protruding. I then went to Michaels (an arts & crafts store) and bought a 9"x12" piece of foam (they sell these in single units and thicknesses). From there, I used a socket to poke holes through it for the tubes of the Evaporator core and glued it to the original one. When I placed the heater box back onto the firewall, it made a snug fit.

Here's a pic.

[mutantcapri1979]

I'm just seeing this thread for the first time and I know that you need an entire seal unit. My method may not work for you but here goes.

Two years ago, I changed my '79 air conditioning parts over to the '87-'93 style and had to figure out a way to fix/modify my original seal because the evaporator core tubes protruded horizontally (side by side) as they came out of the firewall. The '87-'93 style has these tubes in a vertical style, so it was a whole new ballgame.

I had to trim the parts of my original foam that protruded into the engine compartment so that the original seal was flat, with nothing protruding. I then went to Michaels (an arts & crafts store) and bought a 9"x12" piece of foam (they sell these in single units and thicknesses). From there, I used a socket to poke holes through it for the tubes of the Evaporator core and glued it to the original one. When I placed the heater box back onto the firewall, it made a snug fit.

Here's a pic.

I know this post is 11 years old, but do you still have the pic?

[Hissing Cobra]

Unfortunately I cannot post them because this site doesn't automatically resize them and they're too large to post here. I can e-mail them to you if you'd like.

[Hissing Cobra]

Here's a link to the type of foam pad that I bought. I was actually able to go to Michael's Arts & Crafts store and buy single sheets.

https://www.amazon.com/Sheets-Better...9563784&sr=8-1

https://www.michaels.com/shop-catego...es%20-%20Grade

[mutantcapri1979]

No problem, I had to resize a bunch of stuff recently, it's a pain. Thanks for links to the foam pad, I definitely have a good idea what I'm doing now. Thanks again.

[Hissing Cobra]

No problem, I had to resize a bunch of stuff recently, it's a pain. Thanks for links to the foam pad, I definitely have a good idea what I'm doing now. Thanks again.

No problem. Good luck!

[billkandi]

You could try checking with local upholstery shops, to see if they have gray or black closed-cell foam.

Maybe repetitive, but I seem to remember someone used one of those dense foam floor mats that you can stand on for concrete floors, and maybe another got something from Hobby Lobby (?) It's been awhile, but those pop to mind.