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Disconnect the negative battery cable using a ratchet and socket. Then, drain about half of the coolant from the radiator by placing a drain pan beneath the radiator's drain plug and removing the plug with a ratchet and socket.

Label the two heater core hoses with painter's tape on top of the engine near the left side and then remove them with a flat-head screwdriver.

Climb in the cab and open the glove box. Remove the black cable on the left side of the glove box by pushing the release pin with your fingers. Then, pull the glove box out with your hands.

Unbolt the plenum chamber cover to the right of where the glove box was using a ratchet and socket. Place shop towels on the floor beneath the dash to protect the floor from leaks. Remove the heater core with your hands and allow coolant from the heater core to drain into the coolant drain pan.

Install the new heater core. Perform the disassembly steps in reverse to complete the installation.

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Q: How do you replace heater core in 1993 f150?
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