Heater Core Firewall Grommet
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Cargo Master
Joined: Dec 2004
Posts: 3,362
Likes: 22
From: Florence, SC
Heater Core Firewall Grommet
Is there supposed to be a grommet or rubber plug at the firewall of the engine compartment for the heater core pipes? I am talking about where the rubber hoses connect to the heater core. Mine doesn't have any sort of plug or cover, and it is somewhat loose and looks like something is missing there.
Cargo Master
Joined: Nov 2010
Posts: 3,244
Likes: 40
If you mean in the glovebox there is a cardboard type cover that restricts access to the heater core. If you mean under the hood then I don't believe so. It appears the core sticks out the holes into the engine bay and my hoses connect on. If you mean vaccumn lines under the glovebox then yes there is a couple grommets I noticed when I pulled my interior the other day, dash etc.
Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
Yes there should be a foam gasket that fits over the heater core pipes. As time and heat takes its toll, it most likely fell apart. I used some RTV and inner tube rubber and made up a gasket to keep water/air leaks from occuring.
Don't use that expando foam. That stuff holds water and rots metal, found out the hard way....
Don't use that expando foam. That stuff holds water and rots metal, found out the hard way....
Post Fiend
Joined: Dec 2007
Posts: 8,521
Likes: 16
From: Lost
If the heater core has been replaced, the foam gasket is likely laying in the bottom of the case, or got tossed with the old heater core. If it's in the bottom of the case, it's usually in many tiny pieces......
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 39
From: EXTREME southwest CT
There is a U shaped foam gasket that seals the heatercore to the box.
At the firewall of my 1987 the Factory had applied some mastic tape to seal the heater core necks on the engine side.
At the firewall of my 1987 the Factory had applied some mastic tape to seal the heater core necks on the engine side.
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Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
Here's what that gromet looks like, this is from a 87 up truck. The 86 older are not much bigger than heater core pipes shaped much like a figure "8"
That 87 up looks much better than the older ones. Only problem is you have to pull the heater box from the fire wall. Not a fun job, but can be done.
I forgot, I did find my fix, and will photo it if I can find it again.....found it.. Looks ugly but works, it's blue RTV and held up since 1992
another view of the 87 up
That 87 up looks much better than the older ones. Only problem is you have to pull the heater box from the fire wall. Not a fun job, but can be done.
I forgot, I did find my fix, and will photo it if I can find it again.....found it.. Looks ugly but works, it's blue RTV and held up since 1992
another view of the 87 up
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