craftsman1956

I just bought a set of gaskets from opgi and I don't know where all these gaskets go.Is the set for the firewall box? Do some of these go on the inside of the car? I just do not see where all these fit.I took the 2 piece fiberglass unit apart and wonder if I should use black caulk silicone to put these back together and caulk it to the firewall also? It looks like a caulk was used in 72.I letter identified each piece if someone can tell me where they go.part number from opgi is CH17468.Thanks for any help.

70Post

Whatever you do don't use silicone on it. Go get some 3M Black Strip Chaulk...PN 08578. It comes in box with bunch of 12" or so strips of this chaulk. You'll have all you ever need with one box of it...maybe costs $12-15 or so. Try an auto paint supply place or an O'Reilly's. It's in a blue box.

You can use this chaulk to seal the two halves to each other and also use it to seal it up the whole box to the firewall. The chaulk doesn't dry out or sag, etc. You will see a small channel in the box halves where the chaulk sits in. You'll probably want to double it up where the back of the box contacts the firewall.

craftsman1956

I will buy some,thanks! $22 at carquest.

Rickman48

Not to to be 'Mr. Correct' or anything, but chaulk is the stuff kids write on sidewalks with - -
Caulk is a flexible sealer - -
We all knew what you meant, though!

70Post

Really?? What else would you call it Mr. Correct?

71 Cutlass

Not to correct "Mr. Correct", but the item used by children to write on the sidewalk is actually spelled Chalk not chaulk. The 'au' version derives its etymology from Old English, a form of dialectic usage no longer utilized in today's society. But ahh, we all knew what you meant.

442_Mustang

Grammar *****!!!

sunsetlimited

I have the same issue! Only a couple of the seals match.

Lady72nRob71

X2 on the strip calk - I used that on my evap box.

Note that 3M calls it CALK - not CAULK. People prefer products or companies with misspellings..........

O's_Car

Just to answer the original question, based on my recent experience (better late than never):

A = seal that goes between the heater case and its backing plate, outboard half (this is where the heater core is mounted).

B & C = seal that goes between the heater case and its backing plate, inboard half.

D = not sure if this is correct, but I thought it was intended to seal the two halves of the A/C case. I used butyl strip tape for this seal instead.

E = seal that goes between the evaporator core and the A/C case.

F & G = seals for the heater core tubes where they feed through the firewall (my set only came with one, my original part only had one).

H = don't know, I didn't use it (it still bugs me that I never figured this one out!).

I = seal that goes over the evaporator lower tube where it penetrates the bottom of the A/C case. There should also be a teardrop-shaped one for the upper penetration.

J = not sure if this is correct, but I used it as a seal between the heater core and the backing plate it mounts to.