The heater coil and a heater core is the same thing. Hot water circulates from the engine and through the heater core then back to engine generating heat for your heater system.
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Loosen the clamps and carefully twist the hose where it connects to the heater core. If you are wanting to bypass the heater core, just run one of the hoses between the two places on the motor where they connect or put a short piece of pipe between the two hoses.
the heater core, heater core hoses or heater control valve is leaking
You will need to remove the water lines from your heater core. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
Remove the water supply lines from your 1990 Ford E3 50 heater core. Remove the heater core retaining bolts. Reverse the process to install your new heater core.
diagram for a 92 Chevy van g20 Heater core