Yes, very detailed and accurate description of the heating/cooling system. Typically, those heater hoses ar going into the passenger side of the cabin, and (i have found) have metal "hoses" coming through the firewall. If you cant find your coolant lines, try looking for a few large, metal hoses coming through the firewall.
On a kinda semi-related note...had to replace the heater core on our '89 S10 Blazer today. Damn....thing was a pain in the ass. Had to undo all sorts of bolts and connections, and move the friggin dash outta the way to get the cover off. I never stop being amazed at how many bolts they manage to put into holding a dash on... After that its a piece of cake. Now i just gotta get it all put back together
