I think there are several nuts you need to remove from behind the dash then the control comes out the front. You will have to remove the cables to get it out far enough to service the switch. I hope this helps. Take care.
SOURCE: remove the heater core in 1988 F250 pick-up
here is a link that should be of some help.
http://www.autozone.com/addVehicleId,1071703/initialAction,repairGuide/shopping/repairGuide.htm?pageId=0900c152801cd90e
SOURCE: how to remove a heater core
you have one of the easiest made. remove the lines from the motor side of the core.open glove box and remove the screws holding the door and tray in place.remove tray.you should now be able to see the heater box and screws.remove screws and pry lightly to remove cover. now you should see the heater core. it just pulls out. PS ive the same truck except i put a 7.3 in it.
SOURCE: free wiring diagrams ford f250 1971
I am sorry but we do not have wiring diagrams, they are copyrighted by Ford and not free to share. You can buy the booklet of diagrams here.
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