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If it is hotter on the inside than it is outside, then it is better to let some of the hotter air out of the car. In my experience, the inside of the car gets hot even in the winter. In the summer, it gets downright scorching inside any vehicle.
White vehicles are significantly cooler in direct sunlight, than are most other colors. Dark colors are significantly hotter inside, in direct sunlight; because of their lower albedo. White has the highest albedo, so it reflects more of the visible light; similar to the reflective shields for the windshield.
Visible light passes through the glass and warms materials inside the car, and it becomes infrared light, which cannot easily pass back out through the glass.
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