Peterbilt 220 - Figure 4-1.2 the DEF Lines Route to the Engine Coolant

4-2
Section 4
Exhaust & Aftertreatment
DEF will freeze at approximately 11° F (-12° C). In order to keep DEF from freezing, all tanks will be heated with engine
coolant. The following schematic shows the routing of these lines. The coolant lines that run to and from the SCR system
must not be tampered with, or used for a source of heat and/or cooling for other components on the chassis. It is critical
that the system is not compromised in any manner.
Figure 4-1.2 The DEF lines route to the Engine Coolant