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Over the weekend i went skiing and took my car, when i got back Sunday i took in all of the food and empty cups and stuff. After school Monday i vacumed out everything else, although i kept my windows open for an hour before hand. So this morning I get im my car go to school, had all the windows up and it was locked. Come back out after school to find literally 20 flies buzzing around, after investigating and finding no evidence of food or anything, I drove off with all my windows down, all the flies were gone when i stopped 5 minutes later. So i get out and role my windows up and lock it. Come back out less than 45 minutes later and there was like 10 more flies in the thing. I was just like you got to be kidding me. So I drive home with all my windows down, thus making every fly go out the window. 40 minutes later I get back in to another 4 or 5 flies buzzing around. Got rid of them then went to work for 4 hours. Came back expecting another cold ride home, but there wasn't any more flies....
So I'm thinking right now that there must be a nest or something inside the vents that hatched or something....