Front Heater Core Inspection.

Inspect for cracks, damage, and coolant leakage.
- If any problems are found, replace the front heater core.
Inspect for bent fins.
- If any bent, use a flathead screwdriver to straighten them.
Verify that the front heater core inlet and outlet are not distorted or damaged.
- If they are distorted or damaged, repair them using pliers.