The interior of the vehicle will still heat up like an oven. Do not leave your candles, your chocolate, and please, please, please, do not leave your pet or your children. And if you see someone who does, give them hell about it. This is no joking matter. Heat kills pets in closed cars.
Heat kills children in closed cars.
This is not hyperbole nor unfounded panic. It's in the paper all the time. Unattended children left in a car, die due to heat exhaustion. Another dog has died while in a parked car. Don't do it.