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March 1, 1999 Service bulletin

Some vehicles equipped with 4.0L ohv engines may exhibit a thumping noise from the cooling system

Ford technical service bulletin 12583 for 1998-1999 Ford Explorer and 1998-1999 Ford Ranger.

Bulletin number
12583
Component
Engine and engine cooling: cooling system
Summary
Some vehicles equipped with 4.0l ohv engines may exhibit a thumping noise from the cooling system. Tt

Owners of these vehicles have filed 401 complaints in the engine category.

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