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Pop the hood, locate the A/C compressor. Turn the A/C to its highest setting, and let idle for 5min or so. Look to see if the compressor is constantly on or cycling. If cycling you are low on freon and need recharged. Very common cause of noticeable power loss with the A/C system running. Nice thing is if it is an issue with the system, even needing a recharge, you'll be covered under warranty since its only a 2010.