If it's a water tank, I forgot to fill it with water, and it's frozen. The best way is to drag the car into a warm warehouse, let it melt naturally and bake it with fire. If the internal ice is serious, it will melt instantly, resulting in secondary ice on the body and water tank. There is no way, enter the warm warehouse, cover the car with tarpaulin and plastic, light a fire inside, and slowly melt.
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