Ed McClellan Posted February 10, 2015 Report Share Posted February 10, 2015 Sludge in the heater core is due to Ford treating suppliers like crap, forcing parts to be casted instead of milled. Sand castings in the heater core turn to sludge. Even if you get them to replace with another part, it's still a crap part that will do the same thing in 4-5 years. Quote Link to comment Share on other sites More sharing options...
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