How do you change the heater core in an 1992 Oldsmobile Achieva?

i changed heater core in a 1995 Oldsmobile achive you have take your dash under neath just about the centercloser to the right also you have jack up your car theres two hose you have to take off its har get them off and on its alot of work it takes time to do it right a 1989 grand am heater core will fit it as long as it has a 3.1 Fred zeestraten