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2004 To 2007 Failed Egr Coolers

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A possible explanation for why the ’04 to ’07 EGR coolers tend to fail more than the earlier versions is because a round tube flows better than a square one. At Diesel Tech we found a whole box of failed ’04 to ’07 coolers. According to Loren Taylor, retrofitting an ’03-style EGR cooler onto newer engines is not out of the question for those wishing to keep their EGR systems intact and experience fewer problems.