Heater problem
1999 Lincoln Town Car V8 Front Wheel Drive Automatic

how do you change a heater core in a 99 towncar with air

This is an 8.2 hour job for a shop to do so it is no easy task. There are way to many things to try to tell you to do that have to be done right so that you don't deploy the air bags and so on. So I either recomend that you go to your local parts store and buy a repair manual like haynes or chilton so you have all the steps as you need to remove the entire dash board to get to it or find a trusted shop and let them do it. I am sorry I can't give much more but like I said it is just so much to try to tell on how to replace it, that it would take hours just to write it out. Once you have a book if you get stuck in area's then get back to me and I will try to walk you through it.