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The dash does not have to be removed for heater core replacement. Remove any paneling for heater box access and remove box assembly and change core. Flat rate time at a shop is about 1.9 hours to complete this repair
The heater core is located in the heater box, under the passenger side of the dash. Most FORD heater boxes are snap-clipped together, and if you remove the rear panel from the heater box, you will see the heater core...it looks like a smaller radiator...twist the heater hose off of the heater core (x2) from the engine side and gently remove the heater core from under the dash. When replacing the new heater core, be very careful re-installing new hoses to the core...it is a fragile thin metal that can leak almost instantly if tweaked too roughly...replace all parts in reverse order of removal.
it is under the dash in the center of the dash.remove the heater hoses from underneath the vehicle,remove the sound insulaters from under the dash,remove the air duct,and remove heater core access panel screws, remove heater core straps,remove heater core.
major job, you will need to pull the dash out of the way, disconnect wiring under dash steering colum out of the way, the outside right inner fenderwell needs to come out to get access to a stud, remove nuts from studs holding heater core case, remove inside screw holding top and bottom of heater case, remove heater core, big big job,
It appears I was incorrect about removing the dash assembly, here are the instructions from a Buick owners club.
Under the passenger dash is an access panel that will allow you to remove the heater core, it really isn't that hard, there are lots of little dash screws and panel screws to remove before you get where you need to be but at least it is roomy. The AC evaporator is located by the heater core. I will give you a tip. I changed mine last year and the heater core that I ordered for my 92 Roadmaster was not correct, when I took my old one out and matched it in a book at the local part store, the heater core for my vehicle was listed as a 96 Caprice???? The car has been in my family since it was purchased new and the heater core had never been changed!!!! Explain that one!Oh yeah, one more tip, if your heater core is leaking, this access panel lowers towards you, if there is nasty sweet smelling water in there it will pour all over you, be careful! Caprice parts are the same as a Roadmaster,so if you ever need anything just look up caprices
NO, BUT THE COMPLETE HVAC MODULE NEEDS TO BE REMOVED. THIS IS BASICALLY THE LARGE BLACK AIR DISTRIBUTION BOX LOCATED UNDER THE RH SIDE OF DASH. THE RH BODY MOUNT BUSHINGS ARE ALSO GOING TO NEED REMOVAL & THE BODY SLIGHLTY RAISED TO GAIN ACCESS TO CORE UNDERHOOD.