WenmarOpen by Wenmar Pro

Service bulletin 990602012C

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 id623086
Published by NHTSA2001-10-26
Manufacturer's number990602012C
Manufacturer's date2001-06-01
Replaces990602012B
NHTSA componentENGINE AND ENGINE COOLING

NHTSA's summary

SOME CUSTOMERS MAY COMMENT THAT THE HEATER IS INOPERATIVE, BLOWS COLD AIR, ENGINE MAY EXHIBIT AN OVERHEAT CONDITION OR THE COOLANT RESERVOIR HAS RUST IN IT. *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, 1998
CHEVROLET S101996 to 1998
GMC ENVOY1998
GMC JIMMY1996 to 1998
GMC SONOMA1996, 1997, 1998
OLDSMOBILE BRAVADA1996, 1997, 1998

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

Recalls for the same vehicles and component
19972011997-11-18. Engine

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
1300890092023-12-11. Service bulletin. Expanded Availability for Remanufacture and Return (R&R) Electronic Control Modules
PI09692018-06-04. Service bulletin. This preliminary informational bulletin provides information on High Oil Pressure on Startup After Engine Replacement Concern.
0406030022005-03-11. Service bulletin. DIAGNOSTIC INFORMATION FOR INTERMITTENT VEHICLE NO CRANK DEAD BATTERY. *EH
0406050012005-01-03. Service bulletin. SERVICE ENGINE SOON (SES) LIGHT ILLUMINATED, DIAGNOSTIC TROUBLE CODE P0420 SET. *TT
30812004-11-17. Service bulletin. SERVICE ENGINE SOON LIGHT AND P0300 WHEN TOWING, CRUISING UPHILL OR ON HARD ACCELERATION. *TT
020682004-07-10. Service bulletin. NO START WITH DIAGNOSTIC TROUBLE CODE (DTC) P1626 OR P1631. ALSO INCLUDES 1998-2004 CHEVROLET, GMC FULL SIZE TRUCKS/ UTILITIES/ VANS. *TT
012252004-07-08. Service bulletin. ENGINE COOLANT LEAK AT INTAKE GASKET. * MJ
017272004-04-30. Service bulletin. 4.3 L35 LU3 RATTLE OR BUZZ NOISE FROM ENGINE. SIT BULLETIN 1457619. *TT
0306010242003-12-04. Service bulletin. RATTLE NOISE IN ENGINE. *TT
030601024A2003-12-02. Service bulletin. RATTLE NOISE IN ENGINE. *TT