How do you replace the heater core in a 1977 Ford F150?
Disconnect battery cables remove entire dash assembly. (be sure to use a camera or other means to track the removal steps.) The basic order of removal is:
1. Glove box (spring loaded, bend all the way down and remove three bolts)
2. Pop 2 covers of near defrost vents by windshield
3. Remove bolts
4. Un-snap radio/ac cover and the molding that goes directly over steering column. Also unsnap fuse box cover and the oval piece on top of the center part of dash.
5. Un screw suicide handles and molding that runs up the windshield behind them
6. Remove all remaining bolts to free dash.
7. Remove radio/ hvac assembly **(note wire positions!!)
8. Remove dash
9. Remove speedometer/odometer cluster **(auto trans gear indicator (park, reverse,etc..) Unsnaps and remains in place)
10.remove air bag
11.remove dash support frame (there will be lots of wire harness and mounts you most note in order to reassemble dash)
12.unbolt heater core box
13.**under hood, directly to the right of main fuse box, on firewall** remove heater core hoses by unsnapping 'quick connect brackets'. *note: the 'quick connect brackets' are a pain to get off. During reassembly, buy new ones, coat with wd40 and snap on to new heater core. Wd40 will save you an hour during the reassemble.
14. remove vent dirctly above heater core box
15. carefully remove h.c. Box
16. remove air blend door and heator core behind it *(be carefull not to damage insulation on firewall or h.c.box
17. the install is reverse of the removal
I got an average quote of $900.00 from mechanics in my area. This job is a pain, it took me eight hours to complete. Be sure to keep your bolts organized as you remove them, have a friend help you, be prepared to spend $100 on parts, good luck.
There is no short cut or fast way to do this. The dash has to come out to access the heater box and replace the core. So the steps in replacing the heater core are to disconnect the heater hoses, remove the dash, to access the heater core cover on the front of the heater case and replace the core. Reassembly is in the reverse order as disassembly. Fill the cooling system with new coolant…
block heaters are not standard on f150's. Thus if it was ordered with the option, dealer added or aftermarket installed it may have a block heater. Best way to find out if there is a block heater is to look very closely behind the grill and look for a plug that looks like a male end of an extension cord.