isx cm871 coolant pressurized

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(03-14-2016 )jlgc905 Wrote:  I recently did the {**Content removed by protection bot**- content.}. Its a used truck that i bought. 2009 pete 387. Im having issues with loosing coolant. I ve noticed that with fan clutch onn at all times nothing happens. And with fan off amd NORMAL TEMPERATURE i IMMEDIATELY lose coolant. System is being pressurized. Water is leaking from overfill hose. Any ideas??

Last week I had the same issue. It was the compressor head. Funny, I bought a new reman compressor a month ago, whoever has rebuilt that head he tightened the bolts too hard (they are rated 5 Nm) when I took them off it felt a lot more than that. One bolt was cracked, loosed gasket, pressure in the coolant system. It is a easy fix, buy a repair kit from cummins 150-170$. Instead of draining the coolant off I used two end caps and two threaded plugs to block the coolant flow