Cadillac Repair: 19997 Northstar, heater core, test procedures

Question
How do I replace the heater core on 1997 SLS w/ Northstar engine?

Answer
You will need, If necessary, Electrical schematics, Test procedures and picture locations of the components within the system that is causing you problems of which can't be done on this website which only allows one picture.  I do not have a website so you will have to e-mail: onlineautohelp@msn.com in order to obtain the information.