How to remove a heater core in a 1986 ford f250 with the 6.9l

Remove dash

disconnect heater core hoses in the engine compartment

open heater box, and remove the heater core.

it could be your heater core leaking - you will be able to see why
the vents won't switch when you take the heater box out to do the
heater core

you will have to remove entire dash,it's a long labor process,the core is just behind dash in a box on passenger side.










TIM

under the dash on the pass side there is a large black plastic box. take out the 6 screws and pull off the cover. there is a wire attached to the top that controls a flap, that just lifts off. under the hood loosen and remove the 2 host clamps right at the firewall area. Push the metal tubes in to the firewall. Then reach back in from under the dash and pull out the old core. put the new one in reverse order.

did u replace the heater hoses as well. When u run your ac an idle up valve raises your rpms slightly whitch will pump more coolant. Other than that they should have nothing to do with one another.

1976-79 Without Air Conditioning

1. Disconnect the temperature and function control Bowden cables from the heater housing. This must be done to prevent damage to the cables.
2. Disconnect the wires from the blower resistor.
3. Remove five screws attaching the air inlet (vent) duct to the heater housing.
4. Disconnect the blower wires.
5. Drain the radiator and remove the heater hoses from the heater core.
6. Remove three heater stud retaining nuts and remove heater.
7. Remove gasket between the heater hose ends and the dash panel at core tubes.
8. Remove heater core cover and gasket (four screws).
9. Pull heater core and lower support from heater.

To install:

1. Install foam gaskets on heater core and install in heater assembly.
2. Install the core seal and cover plate.
3. Position heater assembly in vehicle and install three stud retaining nuts.
4. Connect heater hoses to heater core and fill radiator.
5. Connect blower motor wires.
6. Place defroster nozzle on heater so that the defroster and heater openings are in the up position, and there is no air leak around the seal.
7. Install air inlet (vent) duct to heater. Push duct firmly against seal on side cowl and tighten five attaching screws.
8. Connect wires to blower motor resistor.
9. Connect temperature and function control cables to heater, and adjust the cables.
10. Reinstall gasket between the heater hose ends and the dash panel at core ends.
11. Fill Cooling System.

Hope this helps you! Please remember to rate my solution.

Lefty64

I believe this is the easiest heater core ever invented. If it is like the 1986 model. I believe it is. You take out the glove box door. The heater core is right there under a cover in the duct work.

Pull the dash, here are a couple links http://www.allfordmustangs.com/forums/5-0l-tech/92743-heater-core-r-r-1986-a.html and also http://www.mustangmonthly.com/howto/5652/index.html these will give you an idea if your up for the job or not please rate -jeff

Try downloading the ford service manual and making a cd instructions how to do this on the site
http://www24.brinkster.com/sdhartney/linc/linc.htm

look on right side for ford service manuals

Hope this helps you

it is behind the plastic venting under the dash it has to be removed to get to the heater core