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Your 2005 Chrysler Pacifica comes equipped with a timing chain that operates the water pump and other parts. Generally, this chain should remain effective for the lifespan of the vehicle or at least up to 100,000 miles without replacement. It's essential to ensure proper engine lubrication. If you notice unusual rattling or loud noises, especially from the timing chain's connection to the engine's camshaft and crankshaft, it may be a sign that the timing chain requires attention. In such cases, it is best to have it inspected by a professional at the dealership if you are not experienced with engine work.
In the 2005 Chrysler Pacifica, the 3.8 L model comes with a timing chain.