The heater core is located inside the engine compartment on the passenger side at the firewall. Right on top of the cowl theres a plate that is screwed down. Remove screws and sealing rubber if it's in the way. lift off the plate. It may be glued down with some kind of sealant. You should see the whole heater core inside a kind of box. Disconnect hoses and pull it up from the top. All heater cores should be this easy.
Disconnect the negative battery cable.Drain the cooling system into a clean container for reuse.Remove the air cleaner and duct assembly.Remove the wiper linkage.Remove the heater hoses from the heater core.Remove the lower center console.Remove both instrument panel insulators.Remove the heater outlet module screws.Remove the heater cover.Remove the heater core mounting clip and line clamp screws.Remove the heater core.Install the heater core.Install the heater core mounting clip and line clamp screws.Install the heater cover.Install the heater outlet module screws.Install both instrument panel insulators.Install the lower center console.Install the heater hoses from the heater core.Install the wiper linkage.Install the air cleaner and duct assembly.Refill the cooling system.Connect the negative battery cable.Run the engine to normal operating temperatures; then, check the climate control operation and check for leaks.
To change out the heater-core in a 1986 F-150, you must access the old heater-core through the glove box. You must remove the glove box by removing the screws that hold it in. Once this is accomplished, you must loosen the clamps on the hoses that are connected to the old heater-core unit. Then remove the hoses from the old heater-core and slide the old heater-core out through the opening where the glove box use to be. Install the new one using these instructions in reverse! Presto...installed! Mechanic Man
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