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If it is the same as a 92 F250 4x4 diesel it's actually pretty simple. First, take out the glove box by opening it and pressing inward on the two tabs at the bottom. Right behind there is some wiring, and a wiring module that needs to be disconnected and moved aside. After that is off the black plastic heater core cover can clearly be seen. There are about six screws that hold that cover on, a couple are a little difficult to get to. Once the cover is off you will see the core. Disconnect the lines in the engine compartment and with some effort, you will be able to pull the core out from behind the firewall (it is a little difficult as the clearances are a bit tight). Replace the new heater core, replace the cover, wiring and wiring module, glove box and connect the hoses. Run the vehicle until warm, and then double check the coolant level.

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