Paccar Kenworth T170 Hybrid 2011, Builder'S Manual

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Section 4
Exhaust & Aftertreatment
4-2
12/11
DEF will freeze at approximately 11° F. 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 .
DEF Tank
(Small Tank Shown)
DEF Tank
Heating
Element
5/8” Coolant Hose
(Green - Draw)
Return Tee Draw Tee
Coolant
Bulkhead
(Frame-
mounted)
3/8” Coolant Hose
(Blue - Return)
2/2 Coolant
Valve
3/8” Coolant Hose
(Green - Draw)
DEF Dosing Module
(Injector)
5/8” Coolant Hose
(Blue - Return)
Draw Port Return Port