The most common place for an air conditioner refrigerant or water leak to occur is at the indoor evaporator coil cabinet or along the copper refrigerant brazed joints. Indoor evaporator coils are prone to microscopic pinhole leaks caused by formicary corrosion over years of service. For water leaks, the most common location is at the PVC condensate drain line connection where slime, algae, and dust buildup create a blockage, causing the drain pan to overflow. Verification: Inspect the indoor coil housing for oil residue and check the condensate drain pan for standing water.
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