HEATER CORE INSPECTION [MANUAL AIR CONDITIONER]
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1. Remove the A/C unit. (See A/C UNIT REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
2. Remove the heater core from the A/C unit.
3. Inspect for cracks, damage, and coolant leakage.
4. Inspect for bent fins.
5. Verify that the heater core inlet and outlet pipe are not distorted or damaged.