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Heater box rebuild question


nbristow01

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Well my heater box rebuild is working out great. Just waiting on the seals where the core inlet and outlet stick through the top. New fan installed and runs smoothly.

My question is what to use as a seal between the top and main box (this is the area that has the 6 rivets) I have 3/8 closed cell I used for the flaps. Is this too thick for the top seal? I dont want to cause too much pressure on the rivet areas and create cracking

I'm not as dumb as I look

74 Verona

06 Audi A3

09 Mercedes C300

06 VW Passat

03 VW Conv Beetle

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I just finished my rebuild recently and used 3M Strip caulk... same thing I used to seal the finished box to the firewall opening. It can be flattened out and compresses nicely when you secure the top to the box..

Randy

Get it a a NAPA store. It might last a lifetime.

Don

Don

1973 Sahara # too long ago, purchased in 1978 sold in 1984

1973 Chamonix # 2589243 Katrina Victim, formerly in the good sawzall hands of Baikal.2002 and gone to heaven.

1973 Inka # 2587591 purchased from Mike McCurdy, Dec 2007

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together--they didn't see the need. So unless the halves are warped or have been chipped/damaged where they meet, you probably don't need anything.

Do seal it properly to the body, though. And strip caulk is a good thing to use--it's like plumber's putty except it's black.

cheers

mike

'69 Nevada sunroof-Wolfgang-bought new
'73 Sahara sunroof-Ludwig-since '78
'91 Brillantrot 318is sunroof-Georg Friederich 
Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette) & Kermit, the Bugeye Sprite

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The closed cell foam on the flapper may be too thick. Test the operation before you rivet the whole thing together. I used thinned foam and still needed to chamfer some of the edges.

You know what a job it is to pull the heater and to rebuild it. Take the extra time and try to make it operate perfectly. That said, I still need to finish adjusting the cables on mine that I rebuilt several months ago.

Steve J

72 tii / 83 320is / 88 M3 / 08 MCS R55 / 12 MC R56

& too many bikes

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using 'foam' to seal against metal body parts

in that area will retain rain/wash water and promote

rusting.

3M Strip Caulk will not retain moisture - a better choice.

non-related candy illustration

320Gr5motorcutaway.jpg

'86 R65 650cc #6128390 22,000m
'64 R27 250cc #383851 18,000m
'11 FORD Transit #T058971 28,000m "Truckette"
'13 500 ABARTH #DT600282 6,666m "TAZIO"

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Strip caulking to seal the whole box to the opening in the firewall.

The closed-cell foam is to seal the flaps inside the heater box. Closed cell foam does not retain moisture nearly as much (if at all) as the old open cell foam did. The old open cell foam on the surfaces of the flaps has usually disintegrated and disappeared into the carpet by now. I used some 1/4 foam that was glued into place on the flaps. On a couple of the edges I had to round them to get a good seal inside the heater box.

Steve J

72 tii / 83 320is / 88 M3 / 08 MCS R55 / 12 MC R56

& too many bikes

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