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Can someone tell me what this part is? It's rt behind upper radiator hose. It plugs into an electrical harness. It's melted. About one inch square. Thanks in advance.
 

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My '97 has that, too, and it's not melted. It's just epoxy-filled, and the epoxy is slightly adhesive, so crap is sticking to it. What are the wire colors going to it?
 

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If the connector you are talking about has 4 wires in it, it's the control module for the water in fuel sensor circuit. Originally there was an opaque potting material filling the case. By now many have had that material "melt" out. surprisingly most of them still work. Some have tred to replace the goo with other potting materials with varing results. I'm pretty sure they are still available but I think they're kind of pricey.
 

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Google NAVISTAR Part Number 1811164C2. Shop around as I have seen prices from $55 to over $80.
 

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