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73-87 Chevy _ GMC Trucks => Interior & Equipment => Heating, Ventilation & Air Conditioning (HVAC) => Topic started by: JJSZABO on October 31, 2007, 10:10:00 am

Title: Heater Hose Firewall Seal
Post by: JJSZABO on October 31, 2007, 10:10:00 am: What seals the firewall at the heater hoses?

It's hard to see in the picture but I have no seal.
(http://i123.photobucket.com/albums/o317/jjsabol/Truck%20Pictures/4121.jpg)

The heater hose holes are oblonged, not round so round grommets will not work.

Thanks for looking.
Title: Re: Heater Hose Firewall Seal
Post by: ccz145a on October 31, 2007, 10:43:57 am: Pretty sure there is a glob of asphalt type putty formed around the pipes on the inside. The same stuff used at the a/c housing openings around the accumulator on trucks equipped with that. Don't know where you get it, though. I used plumbers putty, but do not like the look of it. It's white and when touched with greasy fingers looks bad.

Maybe someone else knows more...
Title: Re: Heater Hose Firewall Seal
Post by: JJSZABO on October 31, 2007, 11:41:32 am: Maybe use some black RTV sealant?
Title: Re: Heater Hose Firewall Seal
Post by: VileZambonie on October 31, 2007, 06:22:50 pm: Butyl Tape http://www.filmtools.com/butyl.html
Title: Re: Heater Hose Firewall Seal
Post by: loudnlow87 on October 31, 2007, 08:14:23 pm: asphalt stuff will not work. at the body shop we use this stuff called dum-dum. thats just what its called. any autobody/paint supply, maybe even some parts stores, should have it.
Title: Re: Heater Hose Firewall Seal
Post by: JJSZABO on October 31, 2007, 08:39:24 pm: Thanks Guys ;D
Title: Re: Heater Hose Firewall Seal
Post by: Blazin on October 31, 2007, 08:40:36 pm: Butyl tape. its what they used to use to put windshields in with. Some people call it dum dum.
Title: Re: Heater Hose Firewall Seal
Post by: loudnlow87 on October 31, 2007, 09:42:51 pm: its not exactly the same stuff. butyl tape is MUCH stickier and harder to work with.
Title: Re: Heater Hose Firewall Seal
Post by: VileZambonie on November 01, 2007, 05:00:14 am: Quote from: loudnlow87 on October 31, 2007, 09:42:51 pm
its not exactly the same stuff. butyl tape is MUCH stickier and harder to work with.

Butyl tape is dumdum you can get it in round or flat.
Title: Re: Heater Hose Firewall Seal
Post by: Blazin on November 01, 2007, 06:22:08 am: Hardware or lumber company's tend to sell the flat stuff more common as it is used for metal roofing.