A system for maintaining the temperature of a vehicle audio and/or audio-video deck provided in a vehicle cabin is provided, comprising: an air duct positioned on both sides of the deck for supplying cooled or heated air to the vehicle cabin, a side part of the air duct defining therein a plurality of through holes through which cooled or heated air can be supplied to the deck; a sensor disposed inside the deck for detecting the temperature inside the deck; a side panel provided in the deck, which defines therein a penetration part for introducing cooled or heated air supplied through the through holes into the deck; a guide rail formed to the side panel; a sliding panel guided by the guide rail so as to open or close the penetration part; a driving motor coupled to the deck for moving the sliding panel along the guild rail; and a controller coupled to the deck for driving the driving motor in response to the temperature detected by the sensor so as to open or close the sliding panel, thereby maintaining the temperature of the deck at a target temperature or range.