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Service bulletin 990602012

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 id606523
Published by NHTSA1999-08-26
Manufacturer's number990602012
Manufacturer's date1999-06-01
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

CONDITIONS WITH HEATER INOPERATIVE, BLOWS COLD AIR, ENGINE OVERHEATS, AND RUST IN THE COOLANT 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

Engine

Vehicles listed
CHEVROLET BLAZER1996, 1997
CHEVROLET S101996 to 1997
CHEVROLET SONOMA1996 to 1997
GMC JIMMY1996 to 1997
GMC S10 PICKUP1996
GMC SONOMA1996, 1997
OLDSMOBILE BRAVADA1996, 1997

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

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0306010242003-12-04. Service bulletin. RATTLE NOISE IN ENGINE. *TT
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000604003B2003-04-28. Service bulletin. ROUGH IDLE AFTER START, AND/OR A SERVICE ENGINE SOON (SES) LIGHT. VARIOUS MODELS INCLUDING THE 1995 CHEVROLET AND GMC S/T MODELS. *TT
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990602012D2002-09-28. Service bulletin. SUBJECT REGARDING RUST IN COOLING SYSTEM, HEATER INOPERATIVE, BLOWS COLD AIR, ENGINE OVERHEATS (FLUSH COOLING SYSTEM). NLM