Would lack of coolant or antifreeze make a car rumble?
It could if you are running it in very cold or very hot weather. In the winter, the engine has to warm the fluids and since the fluids are cold and thick, it takes more engine force to move them. In the summer, they are too thin so the engine isn't fighting the viscosity of the fluids. It's always best to make sure antifreeze/coolant is full. Always check them when the engine is hot. NEVER check Radiator HOT!
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