Heater Core: Testing and Inspection

1. Remove the heater unit.
2. Remove the heater core from the heater unit.

3. Inspect for cracks, damage, and coolant leakage.
- If any are found, replace the heater core.

4. Inspect for bent fins.
- If any are bent, use a flathead screwdriver to straighten them.

5. Verify that the heater core inlet and outlet are not distorted or damaged. Repair with pliers if necessary.