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I once did a test regarding temperature in vehicles. It was focused on protecting camera equipment but the principles still apply here.
The hottest areas were, as you might guess, the dashboard and the drivers and passengers seats.
The glovebox was hot but not as hot.
The trunk tended to be cooler than the glovebox.
The best thermal protection I found was a heavy wool blanket and the coolest I ever kept the equipment while testing was inside a cooler which was surrounded by a thick wool blanket.
I wish I had the numbers handy but swaddling stuff in the thick wool blanket reduced the temperature of objects by somewhere around 60% vs leaving them sitting on the driver's seat and something like 30% over just leaving stuff in the trunk.
Regardless, I've seen a gun so hot from sitting in Arizona sun that it would have raised blisters if you picked it up, but the firearm and ammo were unharmed.
Now if you were going to repeat those conditions on a regular basis I'd shoot the mag and refresh my ammo every month or so just to be safe.
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