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Q: How do I troubleshoot water pump? With tension, serpentine runs off pulley. on 1997 BMW 740iL

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Wife got stranded when she heard loud rattling noise and noticed coolant from under front of engine. Then we saw that serpentine belt runs off of water pump-fan pulley. When I put belt back on and re-tension, it runs 1-2 way off as soon as I start the engine. Possible for pulley to come loose and tilt down under pressure?
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