I build cars, so I’m qualified to answer this: nope, there isn’t. At least, not in the sense that there’s something there to specifically keep heat or cold out or in. The headliner, of course, has insulating properties, and there are all sorts of sealers and mastics applied everywhere in the car, but most of the insulation is intended for noise and fluids (water and air).
I’ve mentioned previously that in my teens a friend of my younger brother took advantage of the fact his father collected a certain type of car, and had about five of them of various colours.
He parked them all in the sun at the same angle and measured the temperature in each over a day. Instant winning school science project. The results were unquestionably against owning a black car and in favour of owning a white car in a hot climate.
The only disadvantage to owning a white car is the difficulty of keeping it clean.
Actually, I’ve found the exact opposite to be true. Most of the cars I’ve owned over the years have been lighter colored ones (white, silver, light blue, pale yellow, etc.) Those cars never showed dust or light grime. Whereas my latest vehicle (Metallic Arctic Blue)(meaning damn near Black) shows every dust mote and water spot.
I think it depends somewhat where you live - dark mud splatter vs pale desert dust.
I have lived in Southern California since 1952 and water in the Los Angeles area is notoriously hard, and leaves spots and streaks on car metal surfaces and glass. Including on white cars.
I’d like to see it expanded to four cars - two white exterior & two black exterior x two black interior & two tan interior. Maybe a further expansion to cloth vs leather, etc. I refuse to get a black interior, to the point that I bought a different colored exterior because of the manufacturer’s you can only get this interior with that exterior scheme.
Leather may cool off faster; however since it’s initially hotter, the the back of your thighs are fused to the seat when it does cool off.
It’s kind of like the argument about black versus white roofs. Yes black will radiate heat away better than white, but the black HAS to radiate away more because it absorbed so much more heat to begin with.
The fan should go on in the car if the temperature is too high. Doesn’t have to go on continuously.
This is a common misconception, but not true - see post #9.
Get a remote starter. Before you leave your car. crank the AC all the way up. Ten minutes before you go back, remote start the car. Safer than remote opening the windows for 10 minutes before you go back to it.
No remote start, but I’ve discovered that hitting the rear hatch button when I’m still a ways away from the car really sweeps the over-heated interior air out of the vehicle. Then I crank up the A/C, open the moon roof and things get down to comfortable fairly quickly.