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The water pump has a weep hole on its bottom edge near the pulley, and that will be evident as leaking because the inside of the pulley will usually be greasy or muddy, and wet depending how long it has been leaking, and whether or not you were driving in a dusty environment while the pump was leaking. If the pump is leaking, it will be dripping from that weep hole

If it is a leaking gasket, the inside of the pulley won't be as wet, and the leakage won't be from the hole, but right from the joint between the pump body and the engine block.

I've also seen the leakage from the intake manifold gasket running down along the pump.

You'll need a decent light, and get yourself in an awkward position to see all this.

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Q: How do you tell if your water pump is leaking or a bad gasket on a 1997 Pontiac Transport because water is leaking bottom of van below battery?
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