because it is about a half day job. The heater core is in the big white plastic box on the top of the fire wall under the cheap black plastic cover. Pull the wipers (careful of the windshield, it will crack if you let them snap down), then carefully work the black plastic cover off. The heater box is in the center. Pull the two hoses that go to it though the firewall (drain some coolent off first), disconnect the fan motor (on the driver side), any control cables (I think there are two, but it has been a while), and then loosen the large metal strap with the single screw. Then go behind the dash and pull the air ducts off either side as well as any vaccum control lines. You will have to pull the panels off on the drivers side as well as the glove box to do this. Once you think you have everything off go back up top and start pulling the box upward. It is held in using double sided tape all the way around so it will not break free easily. Be careful and look for anything you might have missed as you pull it out. It should take a lot of force at first, but then almost nothing as it comes up, if you encounter force after it has broken away stop and see why, alot of these parts are expensive and a pain to get, so it is easier just not to break them in the first place. Once you have it out you can beack it open to get to the core. The box splits vertically and is held together using metal clips. Take care when you open the box as the control doors will want to fall out, just go slow so you can see where they came from. You can then replace the core. Another word of advise: while you have it all apart replace the brushes in the motor (another weak point, and not worth taking it apart again), as well as lub the ends of the air doors. This does wonders for having the system work smooth, as well as taking some of those annoying sounds out. Good luck with it.