Loosing coolant

[Lonetrucker]

Hey about a month ago I had the injector cups fixed and the mechanic did not drain tanks so I was continually getting it to happen out the separator. Last weekend had a mechanic to drain tanks and said he got about 4 gallons out of the tanks.it is expected to have more come out here and there he said because of the residual. Now i am still have issues where after my run for the day I come back to coolant being half way low. I had some hoses replaced on the left side of the engine replaced last weekend also. I do notice that the lower radiator hose is wet but no drip enough to be Enough for 4 gallons. I do think it MAY could be of me using heat because of the cold weather we have be having or head inssue. The truck is deleted Cummins isx15 prostar (2014). Any help please