Correct answer
a pulley attached to the crankshaft.
A crankshaft pulley supplies movement in this system. The pump circulates coolant through the engine circuit and other components according to its design. Not every engine has the same arrangement: other drives and electric pumps exist. Follow manufacturer instructions for both the drive and suitable coolant.
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a gear on the camshaft.
the starter motor pulley.
a pulley attached to the crankshaft.
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