With a six-cylinder engine, the water pump is driven by a toothed belt - everything should be in order here.
The situation is different with a four-cylinder engine: this engine must never be started without a V-belt and therefore without a water pump drive! Otherwise, you risk severe engine damage.
Cold water is heavier than hot water. Even without a water pump, it circulates slowly through the engine and radiator. This thermosiphon and self-circulating cooling is insufficient for modern engines. More information is available in the section Generator.
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