how do i replace a 1987 grand marquis heater core

all l can tell you is you need a good repair manual ,there is too much detail in doing this to try and get it right on here,i use a manual when doing each vehicle on that job,its better and it has the needed details in it to get the job done with,good luck.

you will have to remove the entire dash board from inside the car. after that, it is pretty self explanatory.

good luck

had to do that once, tore the dash out, hack saw bunch of tools, what a piece of crap that car was.
does yours have a slide venturi carb?
Ford crap ,never again

Chevy for ever

l usually pull the bottom of the dash on the right side out a little, then fight to remove heater core box. On this model l never remove the dash