Just noticed the pictures waynrayn posted on the first page are not showing up any more. Here they are uploaded to PIP:
Under dash, showing a non-AC heater core box. Note the blue clips on the vent cable.
Aftermarket AC system installed in a non-AC Fiero
Aftermarket AC system with the panel opened to remove the heater core
[This message has been edited by RWDPLZ (edited 07-28-2015).]