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I have a 2005 Cummins 5.9 and the other day I was putting in head lights and I went under and saw a puddle of coolant I noticed that there was some near the oil pan too it's close to the water pump and I have no idea what it is or how to fix please help !!!!
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Could be the waterpump, could be the o ring behind the coolant inlet bracket (bolts to the block). Could be leaking from the tstat housing on the back side?

You should clean it up and pressurize the system and see where it's beginning.
 
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