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International Automotive Technicians Network
Re: Repeat heater core failure
Posted to HD/Fleet Forum on 4/18/2018

2 issues... First ., If the restrictor in the engine heater hose connector is missing, you might have an over pressure or high speed coolant erosion issue.

Second is electrolysis. Plenty of data in the archives. Do NOT add or remove any factory ground wires.... Login to read more.