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Re: 2001 detroit series 40 (DT530E) LOW HEAT OUTPUT
Posted to HD/Fleet Forum on 1/30/2008

Scott,

Did they say if the pump was in gear? That makes the fan run all the time, as well as circulate water through the coolant-to-pump water heat exchanger if the "Engine Cooler" valve is open on the pump panel. They never heat up in the winter if this is ... Login to read more.