I already posted this in the z-car newsgroup, but decided to post here
also as this group is more active.

Does anyone know if there is an easy way to replace the heater core in a
84 300zx with a/c. The nissan service manual is no help at all (the
section covering heating and a/c is almost exclusively a/c related) and
the chilton manual (yes I know how bad chilton manuals can be, but it is
actually more detailed then the nissan manual) says that I need to
disconnect the a/c hoses and take the whole assembly out to get to the
heater core. God I hope that the chilton manual is wrong!! Does anyone
have any insight on the matter (Steve T?).

I also am not sure but it looks like there may be hoses inside the cabin
going from the firewall to the heater core. If so, how in the hell are
you supposed to get to them and what a stupid design? I hope I'm wrong
on the interior hoses.

Thanks in advance,
Keith