ABOUT THE SAME AS THE 86 throwing things and pushing and pulling , except the dash has to come out, don,t even think of replacing the core order the entire heater box assy, it is only about 20.00 or so diff than just the core , an dwill save a few headaches , and you get all the little nitemares new in a box, saves a bunch of time , and by the way any 92-97 trooper or rodeo heater box will fit as long as they are both v6,s 4cyl rodeo won,t fit they all have diff, pt no,s but they are interchangable. be prepared for at least a half day of fussing with it Jerry