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Service bulletin ITS-4491

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 id10039905
Published by NHTSA2011-08-11
Manufacturer's numberITS-4491
Manufacturer's date2011-08-04
NHTSA componentENGINE AND ENGINE COOLING:COOLING SYSTEM

NHTSA's summary

NEW FLYER: INFORMATION TO INSTALL SUPPRESSION DIODE HARNESS AND REPLACE HYDRAULIC COOLING FAN RELAY. *RM

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
UNKNOWN UNKNOWN

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