New to this site. Replacing '96 heater core. Read several other threads but do they apply to '96 Blazer? Can anyone point me to a previous thread for this repair? Thank you in advance guys.

couldnt tell you for sure, but should be pretty similar. if the fist few steps are the same (ie bolt locations) i would assume the rest would be as well.

There are several articles in the How To/Technical Info section at the top of the "Blazer" page. Here's one:
http://www.automotiveforums.com/vbulletin/showthread.php?t=368427
This is for a 98 though. I know I found one somewhere in there that has full pictures. I did my 99. It took a couple of evening.