Q: Battery light on only in summer when a.c. on

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! I have a 1999 mercury mystique. Every summer once it gets hot the battery light will come on and every now and again the car will turn off when I have my AC blowing this only happens in the summertime. I recently bought a brand new battery from Walmart and having the same issues I'm sure once October rolls around the situation will go away but until then what is my problem

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