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Service bulletin 5493

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 id606000
Published by NHTSA1999-08-05
Manufacturer's number5493
Manufacturer's date1999-04-01
NHTSA componentENGINE AND ENGINE COOLING:COOLING SYSTEM

NHTSA's summary

SUBJECT REGARDING DDEC IV AND OPTIMIZED IDLE PROBLEMS. *TT

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

Vehicles listed
FREIGHTLINER ARGOSY
FREIGHTLINER BUSINESS CLASS
FREIGHTLINER CENTURY
FREIGHTLINER FLB
FREIGHTLINER FLC112
FREIGHTLINER FLD

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