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the problem with cold weather and air cars is the same problem as you get with ice forming on the outside of your propane tanks when you run your jet engine, or any kind of torch, or compressed air tool, the expanding air has a cooling affect and the radiator on a compressed air car is there to keep the engine warm as the air can cool it down to -15F and cause it to ice up, also metal starts to act funny when it's that cold, oil thickens and air in the tank condenses and just like how you have to add air to your tires in the winter the pressure in your 12,000psi tank of air will also drop, after all one of the most common ways to compress gases to that kind of pressure is to cool them as a common household 125psi air compressor can't just be turned up or let run longer.
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