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it is under the dash in the center of the dash.remove the heater hoses from underneath the vehicle,remove the sound insulaters from under the dash,remove the air duct,and remove heater core access panel screws, remove heater core straps,remove heater core.
If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired. Heater Housing
The heater housing is usually under the dash and must be removed to gain access to the heater core.
Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
The heater housing is disassembled to get to the heater core.
Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
Remove the heater coolant hoses.
Remove the cable and/or vacuum control lines (if equipped).
Remove the heater core securing brackets and/or clamps.
Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.
First disconnect steering knucke under dash. Remove dash assembly to reveal heater/AC case. Disconnect heater hoses from engine compartment. Discharge and capture AC refrigerant. Remove heater case ,replace heater core . re-assemble .
Well first, if your talking about the radiator hoses when you say the bottom hose is warm and the top is cold, that would suggest to me a stuck thermostat. If not, then the heater core is located inside the truck under the dash. You can follow the heater hoses under the hood to the firewall and that will tell you where, under the dash the core is located. It is kind of a big job, as all the under dash covers will need to come out as well as the glove box. The heater core is inside the heater box, a black plastic box that will also need to be removed. It is important to note that when you are reinstalling the heater box after you change the core, it must be completely sealed, either with RTV or two sided insulating tape.
The leak inside under the dash means that your heater core is leaking and needs to be replaced or by-passed. But by-passing it will leave you with no heater. You didnt mention the year of your truck but most likely you will have to pull the dash out to replace the heater core.
This is a fairly easy fix. Disconnect the heater hoses under the hood. Go to passenger side under the dash remove the lower panel from the dash to access the heater box. Unplug any and all connections on the lower half of the heater box and remove the lower half of the box should be about six screws you should see the heater core and the evaporator core. Heater core skinnier of the two should have one or two straps holding it in remove the straps and remove the core and replace.