Sealing A/C box to firewall engine side

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Topic: Sealing A/C box to firewall engine side

in Forum: C3 Cooling and Heating Systems

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Posted: 2/9/07 9:32pm Message 1 of 3

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suncountry

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Moses Lake, WA - USA

Joined: 4/16/2005

Posts: 2134

Vette(s): 1976 L48 4-spd, Mahogany Metalic exterior, Buckskin interior 350ci/350hp, 3rd owner, fiberglass spring, 255/50-16's Torq-Thrust II

What type of sealant works well to seal the heater A/C box to the firewall and Blower box to A/C box. I stripped it out while replacing the A/C hose and VIR valve. Boy what a job. Glad I did though. The evaporator had a lot of crud and leaves in it. Should get a lot of air flow now

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Sealing A/C box to firewall engine side

Posted: 2/10/07 9:44am Message 2 of 3

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Ten15

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East Hanover, NJ - USA

Joined: 9/25/2004

Posts: 525

Vette(s): '68 Black Conv. Matching 327/300 4 Spd. P/S, P/B, P/W, Tele, A/C

Glen,

I bought a heater box rebuild kit from one of the big suppliers. It included a strip of butyl rubber which is used as the seal for the engine side of the box to the firewall.

Butyl rubber is a soft sticky solid rubber that will form to the firewall and make a good seal. Inside of your box you should see a channel that used to hold a gay sealant. Just roll/pull the rubber to fill this channel & it will form to the firewall when the box is tightened and it won't squish out.

If you don't want to buy the whole rebuild kit, butyl rubber can be purchased at any automotive, home or roofing supply store.

If you can't find it, drom me a pm.

Good luck,

Anthony