Diesel Exhaust Fluid Engine Coolant Control Valve - Operation

OPERATION

The Diesel Exhaust Fluid (DEF) Tank has an internal heating coil to help eliminate freezing of DEF. The DEF Dosing Control Unit monitors the temperature of the DEF in the tank. When it is determined that the DEF needs to be heated, the DEF Dosing Control Unit opens the DEF Engine Coolant Valve and allows warm engine coolant to circulate through the heating coil to warm the DEF in the tank.