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Guess it is a good thing I have my timing cover on a shelf, with the pump and pulley still on. See the attached image. The screwdriver is pointing to the inside-bottom of the water pump pulley. The pulley is really nothing but a shell that mounts to the water pump with four bolts. So, the entire pulley is hollow.
Just because you have to fill the overflow tank does not mean anything spectacular. It simply means you are loosing coolant. You just need to know where it is going.... The garage floor and the road? (hose or water pump is worn out, leaking through the weep hole) Or, worse, into the oil pan or exhaust (Head or LIM gasket failure).
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