I just got through replacing the A/C system in my 82.

When I went to reassemble the box I found I needed something to seal the a/c box. I went looking for something that would easily conform when I tightened the screws but not glue it together. I thought that I wanted a black plumbers putty but I couldn't find anything like that.

I ended up using a butyl rubber windshield install kit I purchased at Autozone. The rubber is black and comes in a rope about a half inch in diameter, when I tighten the screws assembling the box the excess extruded out easily while forming a nice seal. I then formed a airtight seal using the rubber rope at the front of the evaporator where the tubes exit the a/c box. The butyl rubber sticks very well to itself and quickly created a good airtight seal. I think the appearance of the butyl rubber is better looking than the tar looking substance that was on there from the factory.

Thought I'd share my solution in hopes that it might help someone else.

DanK

You kow that they make a gasket for that, right?

and I hope you don't want to take it back apart anytime soon. That stuff is made to GLUE the windshield in and it works - but it does seal nice.

I used the same stuff 4-5 months ago and it's fine. Trying to get the stuff chevy used on the firewall is nasty. If you get it all off you probably spent all day and this soft seal worked great but i thought it didn't harden? Easy to find out. I will post it later. I just grabbed the box and it's not sealed and it's still soft.':dontknow::nanawrench:


SUPRESOFT WEATHER STRIP RIBBON SEALER
WWW.METROMMP.COM (http://www.METROMMP.COM)
METRO MOULDED PARTS INC.

Thanks for the feedback. When I took the lid off the a/c box as a test the rubber seal made strings between the parts but it didn't seem to be overly difficult to separate the parts, that may change over time.

DanK

Use 3M Strip caulk. It is what they use at the factory, doesn't harden and makes a great seal without the drawbacks of butyl.

just plain john, Do you have a link to the gasket you're talking about ?I've been to Mikes Montes and can't find it. Thanks, Wayne

Never mind, I found it !! thanks

http://www.ebay.com/itm/78-88-G-body-new-AC-heater-box-gasket-?cmd=ViewItem&item=310346172366&vxp=mtr

Use 3M Strip caulk. It is what they use at the factory, doesn't harden and makes a great seal without the drawbacks of butyl.

+1 works great, I had to take mine apart to change the heater core.

Thanks,
Dave