Protege DX L4-1.6L DOHC (2000)
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.
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If any problems are found, replace the heater core.
4. Inspect for bent fins.
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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.