I believe most (all?) car makers allow some outside air to come in even when on recirculate. I don't think there is anything wrong with your A/C system.
With my last 2 Miatas many people would to go to a hardware store and buy 1/2" diameter foam ribbon and slide that ribbon into the rubber seal between the top of the hood (nearest the cabin) and the car body. That stopped hot air from the engine from coming out and getting sucked into the intake vent for the A/C system. It made a huge difference when driving with the vent on and the A/C off. I don't know if our Z's have similar intakes or not but it might be worth looking into.
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2010 Roadster, 7AT, Black Cherry, Touring, Navigation, Lighted Kick Plates, Floor and Trunk Mats.
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