Cummins isx air pressure in cooling system

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{"text":"Hello all. I have a 2006 Volvo VNL with a Cummins ISX engine. The egr is deleted.Lately i have been getting a STOP engine light driving down the road for critically low coolant level.I go to the coolant tank and all the coolant has shifted to the left side(reservoir).I open the black top cap and there is pressure in the tank. The coolant levels out after i let the pressure out.I had an oil sample today at Speedco to check for coolant in the oil caused by Head Gasket. Oil Sample came back clean. Does not overheat, normal oil temp, no power loss, no white smoke in the stacks.Coolant tank is turning darkish with gummy residue in the wallsIf anyone may have an idea what it could be i will appreciate any advice.Thanks and be safe","pics":"[]","canComment":true}