Umm... follow the upper hose from the radiator. It's a pain to get the housing off sometimes cause it takes small hands to get there. It's right where the upper radiator hose meets the motor- check this out... autozone has a chilton's manual online...
http://www.autozone.com/servlet/UiBr...3d801947f9.jsp
Like Jester said, if you're looking for the heater core you have to rip the dash out to take it out... bummer. As old as these cars are now the dash will probably crack and that's why I won't touch mine. It's on the passenger side behind the firewall. If you see those two hoses going into the fire wall, they're connected to it. If they (2 copper pipes) are just jutting out and the hoses are connected to each other, then someone previous has bypassed the heater core. Check right behind the passenger valve cover I think. Good luck!