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It is always difficult to replace a heater core on almost any vehicle. If it is leaking then it needs replacing. The reason may be a faulty core when new, or not changing and flushing the cooling system properly or just neglecting the service. Also the system must be flushed with the heater set to hot or the core will not be flushed.

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Q: How difficult is it to replace a heater core in a 2003 dodge 1500 4.7 V8 and why does it need to be after 54000 easy miles?
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