Where is the heater core located on a 1989 Ford Crown Victoria and how do I replace it

Rays correct your fuse box is located to the left side of the steering column under it near the emergency brake and it may have a plastic cover over it with a rounded upper right corner for the flasher

heater core means you had the dash all apart , yes?
that means the computer wiring is in that mess too.
run a computer test 1st

Remove dash

disconnect heater core hoses in the engine compartment

open heater box, and remove the heater core.

http://www.autozone.com/autozone/repairinfo/repairguide/repairGuideContent.jsp?fromSearchPage=true&pageId=0900c152801e4ae1&partName=Heater+Core&partId=0900c152801e4ae1 click on link to see how to remove and install Richard.

The heater core is in the a/c heater box assembly. You will have to remove the entire dash assembly then the assembly will come out. Large job, not for novices.

this job is not for the faint of heart! the dash board must be removed! if you would like to proceed email me and ill guide u the rest of the way

unfortunatly yes it does, I have witnessed one of these changed before in a shop that I was working in and you should plan for a whole day to change the heater core.

Your heater core is located behind the dash. You need to remove the dashboard and your heater core will be located on the passenger side along the firewall. It will look like a small radiator. Get yourself a haynes manual for good step by step instructions and pictures to remove your dash.

heater core is located in the heater box rite next to the blower motor housing on the inside of car under the dash on passanger side

If you replace the HEATER CORE, you might want to also replace the BLEND DOOR MOTOR as well while you're in there. These units tend to go bad very often in Crown Victoria's and Grand Marquis'. The job can be difficult but there are several ways to short cut it. You had to remove the dash board but if you have a 3 ft 2x4 or bar, you can prop the dashboard open after getting 75% of the screws out. The heater box is located behind the glove box. Take screws out from the top of the dashboard(right under windshield) and sides for easy access.