Consider this a public service announcement.
The only safe way to leave your dog in your car is to not do it. End of conversation.
If you have to take your dog with you and you have to do errands make sure that there is an adult who can stay with the dog. If the human can stand it then the dog can stand it. If you are not prepared to stay in the hot car with your dog then don’t leave your dog there.
In temperatures like we are having right now a dog can die in a very few minutes in a car, even with the windows open. When it is over 30 degrees, leaving a dog in a car with the windows down is useless. All it takes is a little planning to ensure that your dog is not left in a hot car.