Replacing the heater core on this vehicle is fairly straightforward and simple. It's surprisingly accessible. First, drain the engine coolant (from the radiator). Then, on the passenger side, remove the panel on the left side of the floorboard. It's velcroed in there. There are no screws to remove, etc. Once that piece is removed, the heater core lines coming in from the firewall are clearly visible going into the heater core. There is one plastic bracket with a single screw holding it in. Remove the screw and the plastic bracket. Next, if you follow the lines from the firewall to the heater core, you'll see two black plastic pieces where the lines connect to the heater core itself. I used a screwdriver to flip the pieces open. Be careful not to break them. Once they're off, the heater core lines simply pull out of the heater core. Be careful to have a bucket of some sort under the lines, because you will loose coolant into the footwell if you don't. After the heater core lines are pulled out, you can simply slide the heater core itself out.
the resistors get very hot, so they put them in the heater ducts so they get airflow when the fan is on, look for a male 4 prong plug held to the heater with 2 screws. the wires from your fan switch should go to it.
The type of fluid required is written on the dipstick.
Check the connections to the solenoid and to the starter.
check vaccuum hose for blockage . also check egr valve if both are good, replace vaccuum booster
Burried behind the dash on the passenger side, good luck.
How do I replace the block heater in my 1998 F150 4.6L?
some possibilities are. low coolant level, open thermostat, pluged heater core,
you should be able to get at heater core just by removing glove box.no need to remove all the dash Is there any instructions on how to do this?
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, and burp the air form the cooling system. 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, and burp the air form the cooling system.
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, and burp the air form the cooling system.
heater core hoses not hot
You have done something to the mix door. It should shut off air to the heater core when the AC is on. It is located right near the core and you may have bent it or just disconnected it by mistake.
No
The heater flap, or blend door, is difficult to replace with OEM parts supplied from Ford. There is an aftermarket kit that makes the job and cost significantly easier at heatertreater.net or on the Ebay listing.
Look up under the passenger's side dash close to the kick panel, and you will see a heater case. there on the front is a removable cover, held on with several 7mm screws. Remove that cover, disconnect the heater hoses under the hood, and replace the core. Reassembly is in reverse order of removal.
Low coolant? Defective thermostat? Heat control cable not adjusted properly? Heater core plugged or airbound?