Good morning, inorder to replace the heater core you need to remove the dash assembly. You will also need to remove the freon from the system due to the heater box having to be removed as well. Here is the information for the dash removal:
Heater box removal:
WARNING: On vehicles equipped with airbags, disable the airbag system before attempting any steering wheel, steering column, or instrument panel component diagnosis or service. Disconnect and isolate the battery negative (ground) cable, then wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to take the proper precautions could result in an accidental airbag deployment, possible personal injury or death.
WARNING: Refer to the applicable warnings and cautions for this system before performing the following operation Failure to follow the warnings and cautions could result in possible personal injury or death.
NOTE: The HVAC housing must be removed from the vehicle and the two halves of the housing separated for service access of the heater core, evaporator coil, defrost door, blend door(s) and the recirculation door.
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