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Service bulletin 644

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 id608081
Published by NHTSA1999-11-02
Manufacturer's number644
Manufacturer's date1999-06-15
NHTSA componentSTEERING:HYDRAULIC POWER ASSIST SYSTEM

NHTSA's summary

INFORMATION ADDRESSING COMPLAINTS OF EXCESSIVE NOISE, LOW POWER ASSIST, LEAKAGE, OR OVERHEATING OF THE POWER STEERING SYSTEM. *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

Steering, Power steering

Vehicles listed
SAAB 9-31999

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

Other bulletins for the same vehicles and component
64421962000-09-28. Service bulletin. CUSTOMER SATISFACTION CAMPAIGN 482 REGARDING NOISE FROM POWER STEERING SYSTEM. THE CHECK VALVE MOUNTED INSIDE THE POWER STEERING BANJO BOLT MAY LOOSEN AND CREATE POWER STEERING NOISE. OTHER POSSIBLE SYMPTOMS ARE HIGH FLUID LEVEL IN THE FLUID RESERVOIR, OR THAT THE FLUID GETS ABNORMALLY WARM ON VEHICLES WITHIN CERTAIN VIN RANGES. *TT
6442196ED22000-09-28. Service bulletin. SUBJECT REGARDING UPDATED CAMPAIGN INSTRUCTIONS FOR CUSTOMER SATISFICATION CAMPAIGN 482 ON NOISE FROM POWER STEERING SYSTEM. THE CHECK VALVE MOUNTED INSIDE THE POWER STEERING BANJO BOLT MAY LOOSEN AND CREATE POWER STEERING NOISE. OTHER POSSIBLE SYMPTOMS ARE HIGH FLUID LEVEL IN THE FLUID RESERVOIR, OR THAT THE FLUID GETS ABNORMALLY WARM ON VEHICLES WITHIN CERTAIN VIN RANGES. *TT