Hello everyone !!! I'm new here....
I own a 2007 mack cxn613. ....
I have bubbles in my coolant reservoir tank...and pressure building up...replace water pump...also replace air compressor. ...same thing happened. ...engine runs great not overheating 175 / 180 on normal conditions 190 / 210 under heavy stress pulling 50 000 pnds load. There's no water on oil or oil in water ..test EGR oil cooler for leaking ..nothing...was ok...lately have notice engine oil temp always on 190/220 but won't rise above 220...at this oil temp ..coolant temp is 210..engine fan starts and cools off water and oil...all looks ok....also check head gasket for compresion leak ....and test gasses coming out on the bubbles. ..negative......what in the hell is wrong ..please any help ??!!!!
