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I did mine a little while back.
I do not remember exactly what to do, but this list should help some.
I have a non-A/C truck and it was much easier then I expected.
A/C trucks may be different (vacuum hose instead of cables ? )
If you have not changed your coolant/water in awhile then begin by draining the system.
I usually unhook the lower radiator hose.
Get a small catch to put under the heater hoses on the firewall and disconnect them and let the coolant/water fall into your catch.
Go inside the cab (passenger side).
Remove the glove box door (screws across bottom of door).
Remove the cables from the heater box (cables go from the control panel to the heater box).
There is one cable for the heater and one cable for the defrost.
It is a good idea to label anything you remove so you know where it goes.
Now go back under the hood and remove the nuts on the firewall (3-4 ?)
If I remember correctly there are threaded bolts sticking out of the firewall with nuts on them (the head of the bolt is inside the cab and attached to the heater box).
So you only need to remove the nuts on the bolts (no other screws or bolts).
You should now be able to carefully remove the heater box from under the dash.
Once the heater box is out of the truck you can easily see the heater core.
Just replace the heater core and install (opposite of removal).
I would recommend replacing the bolts that hold the heater box to the firewall, they can get old and give you a hard time next time you replace the heater core. Also check the foam that seals the door(s) inside the heater box. Replacing the foam now is a good idea.
Good Luck!
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