Step by step guide on how to replace an automotive heater core, though each car
is different in complexity, these steps outline the basic procedure.
Difficulty Scale: 6 of 10Tools and Supplies Needed
Replacement heater core
Fluid catch basin
Screw driver set
Protective eye wear and clothing
Begin with the vehicle on level ground, engine cold, with the emergency brake on.
Step 1 - Locate and remove the negative battery
cable, move the cable end far enough away to avoid an accidental connection.