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Topic: Sealing A/C box to firewall engine side

in Forum: C3 Cooling and Heating Systems

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Sealing A/C box to firewall engine side (1/3)
2/10/07 12:32am

suncountry

Lifetime Member
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Moses Lake, WA - USA

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

Joined: 4/16/2005
Posts: 2134

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 LOL

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Sealing A/C box to firewall engine side (2/3)
2/10/07 12:44pm

Ten15
Former Member
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East Hanover, NJ - USA

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

Joined: 9/25/2004
Posts: 525

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

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Sealing A/C box to firewall engine side (3/3)
2/10/07 2:59pm

suncountry

Thanks for the info Thumbs%20Up

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