1998 ford expedition heater coil repair

Big Pain - Must remove entire dashboard. Drain the coolant Remove the Freakin' pain in the arse dash Open up the box that house the A/C system core and the Heater core Remove and inspect the blend door for cracks where it attaches to the actuator Check the blend door actuator then cut the metal lines on the top of the heater core off for easy removal From the engine compartment pull the heater core lines through the firewall for easy disconnect and that is it You are now ready to start the re-install process. One thing I recommend is while you have everything apart change the blend door actuator, especially if you see traces of where the coolant was leaking in the box. 9 out of 10 times the coolant leaked out through the actuator and it is just a matter of time before the electrical circuitry in the actuator quits working leaving you with no heat or only heat. When I replaced mine it was still working, but the electrical motor with the spiral gear was making a funny noise compared to the new one. Thanks for using FixYa - a FixYa rating is appreciated for taking the time to answer your FREE question.

Instructions for r&r on this are too long to re-write. I suggest you obtain a manual and follow directions you find there. In the meanwhile, be aware that leaking coolant can cause overheating of engine. 'till you fix it, I suggest you remove both heater hoses from the firewall and place a piece of 1/2" copper pipe(with clamps) between them this will result in system being bypassed. You will have no heat but will prevent a loss of your engine as well!!! Most heater cores are definitely not "fun" jobs. You may want to consider having this done in a shop. if you do the job and have specific questions along the way, we'll try to help you!!!
good luck