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A refrigerator or freezer will not cool the inside of you car if its inside it too, they move the heat from inside the freezer to outside it so they will make your car hotter. With the freezer door open they will still make the car hotter as the electricty they use mostly turns to heat, its moving heat from front of frig to the back of the frig.
If your in a dry enough climate a swamp cooler could have a chance. Get a 12 volt fan, cover back side with cloth, spray bottle of water, moisten cloth with water, it could cool down to the wet bulb temperature. I've never tried it, but I might have to I have the fan, but humiditys so high not sure if it's work here most days.
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