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Service bulletin TIB-42-49

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10042756
Published by NHTSA2012-01-10
Manufacturer's numberTIB-42-49
Manufacturer's date2011-09-09
NHTSA componentENGINE AND ENGINE COOLING:COOLING SYSTEM:RADIATOR ASSEMBLY

NHTSA's summary

KENWORTH: CERTAIN MODEL TRUCKS WILL HAVE AN INCOMPLETE DEAERATION WHEN RADIATOR IS DRAINED AND THEN REFILLED DUE TO AN IMPROPER COOLANT LINE ROUTING. *PE

The document

No address for NHTSA's copy can be built for this communication. Ask the dealer for it by the manufacturer's number.

Components

Engine, Cooling system, Radiator

Vehicles listed
KENWORTH T6602010
KENWORTH T8002010
KENWORTH W9002010
KENWORTH W900S2010

Listing a model year does not mean every vehicle of it is concerned: the document says which.