First you need to make sure the truck is cool,so you do not get burned. Release any pressure in the system by removing the radiator cap, being careful not to burn yourself. Remove the two heater hoses at the firewall. Cap the two tubes on the heater,so you do not spill antifreeze in your truck. Remove the heater core access cover from under the passenger side dash(five screws hold it in place). This is done from inside the truck. Then pull the heater core rearward and down to remove it, carefully. Put the new one in the same way you took that one out. Fill your radiator with a 50/50 mix of antifreeze. Run the truck with heater and recheck your radiator fluid after it cools. Be sure to check for leaks.
If its just the cord, then follow the old cord to the back side of the engine ( really the side of the engine closest to the firewall ) and replace it. When the engine is cold, plug it in and you will hear the block heater heating up. If you don't hear anything, then replace the heater also. That requires a little more knowledge.
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