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Heater Core Inspection

WARNING: This page is about a different car, the 2003 Mazda Protege5 and 2003 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the heater unit. (See HEATER UNIT REMOVAL/INSTALLATION  .)
  2. Remove the heater core from the heater unit.
  3. Inspect for cracks, damage, and coolant leakage.
    • If any problems 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.
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