I'm in the proccess of seting up my Liberty to run on vegetable oil. Trying to figure out the hose routing. Where the hose runs from the water pump to the heater core - is that a return line? And if so, where is the best place to tap the supply, to get the hottest water? Am I correct that the heater core only gets hot water when the heater is turned on?

Thanks.

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2006 Liberty CRD.