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A car shouldnt use coolant. The cooling system is a closed system, so if there is any disappearing, you either have a coolant leak or the car is burning coolant. Either way its a warranty issue. The dealer should fix it.
Are you checking the overflow tank? because that can go up and down. its not a solid indicator of how much coolant is in your radiator/cooling system. The overflow tank is just a place to go when the fluid is hot and expands beyond what the system can hold. It could be empty and it doesn't necessarily mean you're low on coolant.
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