99 Navigator Need Help Replacing Heater Core

I really hope someone can help on this project...I've got to replace the H/C in my Lincoln and haven't a clue......Instructions or pictures or even "links" to the answer would be geatly appreciated

thanks
dale

EDIT:

PREVIOUS REPLY HOST SERVICE WENT BELLY UP :(

Rather than doing all this work again, contact me for a 1999 TRK FSM