If you purchased it new from a trustworthy retailer just 3 months ago, and are already getting red-ringed, then send it into Microsoft ASAP. The warranty should still be good on it if it was indeed purchased new, and they will fix it or send you a new Xbox depending on the status of the problem. If it's purchased used or from a 3rd party-then you are out of luck and need to get a repair kit, take it to a professional for repair, or get a new Xbox. Usually with the older versions, not getting enough ventilation is due to the fan being placed too close to the motherboard, and the board overheats because not enough air can be drawn through. Get it exchanged if possible.
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If you purchased it new from a trustworthy retailer just 3 months ago, and are already getting red-ringed, then send it into Microsoft ASAP. The warranty should still be good on it if it was indeed purchased new, and they will fix it or send you a new Xbox depending on the status of the problem. If it's purchased used or from a 3rd party-then you are out of luck and need to get a repair kit, take it to a professional for repair, or get a new Xbox. Usually with the older versions, not getting enough ventilation is due to the fan being placed too close to the motherboard, and the board overheats because not enough air can be drawn through. Get it exchanged if possible.