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Maintenance on 2003 Chevrolet Venture

Does this van have a timing belt or chain that needs to be replaced as general maintenance?

The 3.4L V6 engine on you van is driven by a Timing Chain. It is not a Scheduled Maintenance item, there is no need to replace it unless it is too noisy.
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This van has timing chain and does not need to be replaced unless it makes noise while driving.