The engine coolant temperature is regulated via the engine sensors along with the engine ECM. This programming can't be altered. An engine derate can take place if the utmost engine coolant temperature is exceeded. The engine will carry on at the rpm on the established derate till a shutdown https://chancezwolg.onzeblog.com/13241284/the-best-side-of-perkins-1104e-engine-operation-and-maintenance-manual