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I think the color of the car might make a slight difference, but there are many other factors as well. Your minivan has lots of big windows which let in the heat.
I have a light colored Mazda 5 which has a large, sloping front window, and it seems to be hotter inside than other cars I have owned. The interior is black/grey as well, which probably doesn't help.
I wonder if they make any cars with LowE glass? They would sell well in south TX.

I have a light colored Mazda 5 which has a large, sloping front window, and it seems to be hotter inside than other cars I have owned.

Yes, windows are the biggest factor. However, all things being equal, both light and dark vehicles, of the same make and model, will heat to the same point.

The fact is, the interior of a car can get well over 100 degrees in the summer, regardless of exterior color. At this point, as was noted in an earlier post, the A/C is coming on, and likely staying on.

The color does make a big difference! I live in the high desert in California where it gets over 110 in the summer...for weeks! Fortunately its dry heat for the most part. My silver truck is much cooler (grey interior) no tinted windows, than my dark red (black and grey interior) car (Focus) with tinted windows with a huge sloped windshield. And I use windshield blockers when my vehicles are parked, it is either that or I have to wear gloves to touch the steering wheel.

Just more ways the government can control us. But when the government starts dictating what color your car can be, or how big your TV can be (Obummer wouldn't be able to bring the BIG TOTUS into CA...wastes too much energy) what next? The size of your house in relation to how big your household is? As it is, we're in a drought and my city is sending drivers around as water police. But God forbid you can't just let your lawn die, that's a ticket right there. They catch you hosing your driveway, or "wasting water" you get a ticket...that just happened to my neighbor last week.