I was wondering if someone could help me find something that tells how to replace a heater core in a 1992 buick skaylark gran sport?

 

Because heater core removal in Buick cars is similar All just are not the same.
There is a Haynes manual that may answer your questions. Most can be purchased at various auto supply and book stores.
You could always try Google !
If you really want everything , try www. Helm .com

 

i did use google but wen i search for help i got only part sites to buy the part from them.