Normal, this is because the environment used by the car CD is a dusty space, the CD player itself in order to strengthen the heat dissipation effect, in the body opened a lot of heat dissipation holes, these holes due to air convection in the heat dissipation, resulting in hot cd player.
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At the same time, it also provides a good way for the entry of dust, if the sealing performance of the car is poor, then the body of the CD will soon be covered with some dust, and these dust into the CD machine directly adhere to the upper objective of the laser head, resulting in the permeability of the laser performance of the objective lens, blocking the laser emission and reception, and the CD machine appears to read the disk.