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"FSM" means "Factory Service Manual." If you do some Googling, you should be able to find a downloadable copy. NicoClub.com has free, downloadable manuals at their site.
The heater core replacement is a pretty big job on these. The entire dashboard needs to be removed to access the heating and cooling unit. I'm pretty sure the air conditioning system will need to be evacuated and later re-charged.
 
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