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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.

• 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 pipe are not distorted or damaged.

• Repair with pliers if necessary.