Duramax coolant hose diagram
If any o-rings are missing, Install the rear plate(8) marked & o ring(9) in the diagram, then using heater hose, plumb the hose into the heater core return line (the hose that leads down towards the oil filter). by the way if it is low you will need to figure out why. i think this is the lower coolant hose to the throttle body and supercharger ...
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