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. Use only the supplied Fan are missing please for advice. CY-PA4003U/CY-PA4003U/ 22 23 Air hole 24 English CY-PA4003U/PA2003U/PAD1003U 25 English CY-PA4003U/PA2003U/PAD1003U Wiring Caution . This unit is designed for use in a car having a 12 V negative ground battery system. . Be sure to insulate any exposed wires to prevent short circuiting with the car chassis. Bundle all cables, and prevent cable terminals from touching any metal parts. . Note that if your car has a driving computer or a nav