I Punched a hole in my Engine side Heater Box the last Time I had the Engine out. I have it out again and I just got a Used Replacement Box. I only need to replace the Inboard Firwall side. I see that there is at least one Screw holding it that is comeing threw from the Passenger Compartment. Are there More? I was hopeing to avoid dissasembing the Passenger Side if I could. Anybody know if this is feasable? Its a 1980 with AC of Coarse.

There may be another bolt from the inside.  I can't recall.  Got the AIM?  AIM will show it if it's there.

I had mine out of my 78 recently, no need to disassemble the interior, but I believe there are 3 connections to the firewall but only 1 of these is unbolted from the interior.

Don't forget the one way down by the firewall.

  Forget it !!! Both sides of the Engine  Box need to come off and then they can be seperated. To do this it must have some screws removed from the Inside. Then the left side can be seprated from the right. I spaced out for a Day or Two on this Project and forgot one very important aspect of our C3's that Fiberglass is easy to repair!  A little Mat and some Resin a bit of Sanding and its going to be new again.