1. Remove the heater and cooling unit. 
2. Remove the screw and detach the heater pipe cover.
3. Remove the screw and detach the clamp.
4. Remove the pipe clamp and pipe.
5. Remove the heater core cover.
6. Remove the heater core.
HVAC SYSTEM (HEATER, VENTILATOR AND A/C) > Heater Core
1. Remove the heater and cooling unit.
2. Remove the screw and detach the heater pipe cover.
3. Remove the screw and detach the clamp.
4. Remove the pipe clamp and pipe.
5. Remove the heater core cover.
6. Remove the heater core.