CAMPAIGN:PCV VALVE FREEZE-UP (ALASKA ONLY)

SUBJECT: PCV VALVE SYSTEM HOSE FREEZE

MODELS: 1992-1994 S/T TRUCKS AND M/L VANS WITH 4.3L ENGINES (RPO L35)

GENERAL MOTORS HAS DETERMINED THAT CERTAIN 1992-94 S/T TRUCKS AND M/L VANS EQUIPPED WITH 4.3L ENGINES (L35) USED IN ALASKA OR CANADA MAY HAVE POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM HOSE FREEZE-UP IF OPERATED BELOW -22 F (-30 C). THIS CONDITION CAN CAUSE ENGINE OIL LEAKS THROUGH THE DIPSTICK TUBE AND/OR REAR MAIN SEAL. ENGINE FAILURE MAY RESULT IF THE VEHICLE IS DRIVEN WITH THIS CONDITION.

TO CORRECT THIS CONDITION, DEALERS ARE TO REPLACE THE POSITIVE CRANKCASE VENTILATION (PCV) VALVE WITH A HIGHER FLOW CALIBRATED VALVE.

VEHICLES INVOLVED

INVOLVED ARE CERTAIN 1992-94 S/T TRUCKS AND M/L VANS EQUIPPED WITH 4.3L ENGINES (RPO L35) BUILT WITHIN THE FOLLOWING VIN BREAKPOINTS: GMC TRUCK DIVISION

YEAR MODEL PLANT FROM THROUGH 1992 M/L ALL SOP EOP 1992 S/T ALL SOP EOP 1993 M/L ALL SOP EOP 1993 S/T ALL SOP EOP 1994 M/L BALTIMORE SOP RB503075 1994 S/T PONTIAC WEST SOP RO500571 1994 S/T MORAINE SOP R2502543 1994 S/T LINDEN SOP RK501072 1994 S/T SHREVEPORT SOP R8501909

OLDSMOBLE

1992 BRAVADA ALL SOP EOP 1993 BRAVADA ALL SOP EOP 1994 BRAVADA ALL SOP R2700299

CHEVROLET

YEAR MODEL PLANT CODE FROM THROUGH 1992 M/L BALTIMORE B NB138869 NB233993 1992 S/T PONTIAC WEST 0 N0135426 N0159943 1992 S/T MORAINE 2 N2174562 N2225394 1993 M/L BALTIMORE B PB103446 PB225042 1993 S/T PONTIAC WEST 0 P0103936 P0186380 1993 S/T MORAINE 2 R8104518 P2218374 1994 M/L BALTIMORE B RB102560 RB106656 1994 S/T MORAINE 2 R2100092 R2107816 1994 S/T SHREVEPORT 8 R8104516 R8104516

THE SPECIFIC VEHICLES INVOLVED IN THIS CAMPAIGN HAVE BEEN IDENTIFIED BY VEHICLE IDENTIFICATION NUMBER COMPUTER LISTINGS. THESE LISTINGS ARE FURNISHED TO ALL INVOLVED DEALERS WITH THE CAMPAIGN BULLETIN. DEALERS SHOULD CONFIRM VEHICLE ELIGIBILITY THROUGH VISS (VEHICLE INFORMATION SERVICE SYSTEM) OR SERVICENET PRIOR TO BEGINNING CAMPAIGN REPAIRS.

DEALER CAMPAIGN RESPONSIBILITY

DEALERS ARE TO SERVICE ALL VEHICLES SUBJECT TO THIS CAMPAIGN AT NO CHARGE TO OWNERS, REGARDLESS OF MILEAGE, AGE OF VEHICLE, OR OWNERSHIP, FROM THIS TIME FORWARD. DEALERS ARE TO CORRECT ALL AFFECTED VEHICLES IN NEW AND USED VEHICLE STOCK PRIOR TO THEIR SALE.

WHENEVER A VEHICLE SUBJECT TO THIS CAMPAIGN IS TAKEN INTO YOUR NEW OR USED VEHICLE INVENTORY, OR IT IS IN YOUR DEALERSHIP FOR SERVICE IN THE FUTURE, YOU SHOULD TAKE THE STEPS NECESSARY TO ENSURE THE CAMPAIGN CORRECTION HAS BEEN MADE BEFORE RESELLING OR RELEASING THE VEHICLE.

OWNERS OF VEHICLES RECENTLY SOLD FROM YOUR NEW VEHICLE INVENTORY WITH NO OWNER INFORMATION INDICATED ON THE DEALER LISTING, ARE TO BE CONTACTED BY THE DEALER, AND ARRANGEMENTS MADE TO MAKE THE REQUIRED CORRECTION ACCORDING TO THE INSTRUCTIONS CONTAINED IN THIS BULLETIN. THIS COULD BE DONE BY MAILING TO SUCH OWNERS A COPY OF THE OWNER LETTER ACCOMPANYING THIS BULLETIN. CAMPAIGN FOLLOW-UP CARDS SHOULD NOT BE USED FOR THIS PURPOSE, SINCE THE OWNER MAY NOT AS YET HAVE RECEIVED THE NOTIFICATION LETTER.

IF THE NAME AND ADDRESS OF THE OWNER OF AN INVOLVED VEHICLE WAS UNAVAILABLE TO GMC TRUCK DIVISION AT THE TIME OF CAMPAIGN INITIATION, THE DEALER MUST DETERMINE THE OWNER'S NAME AND ADDRESS FROM THE DEALERSHIP SALES RECORDS. PLEASE PROVIDE THIS INFORMATION DIRECTLY ON THE SECOND COPY OF THE LISTING NEXT TO THE APPLICABLE VIN SO THAT OUR RECORDS MAY BE UPDATED AND THE APPROPRIATE NOTIFICATION MAILED TO THE OWNER. THIS SECOND COPY SHOULD THEN BE SUBMITTED TO THE ADDRESS LISTED BELOW IN THE PREVIOUSLY SUPPLIED YELLOW CAMPAIGN ENVELOPES.

GMC TRUCK DIVISION GENERAL MOTORS CORPORATION 101 UNION STREET PLYMOUTH, MICHIGAN 48170

OWNER NOTIFICATION

OWNERS WILL BE NOTIFIED OF THIS CAMPAIGN ON THEIR VEHICLES BY (DIVISION) (SEE COPY OF OWNER LETTER INCLUDED WITH THIS BULLETIN). A LISTING OF OWNER NAMES AND ADDRESSES HAS BEEN FURNISHED TO THE INVOLVED DEALERS TO ENABLE DEALERS TO FOLLOW UP WITH OWNERS INVOLVED IN THIS CAMPAIGN. THIS LISTING MAY CONTAIN OWNER NAMES AND ADDRESSES OBTAINED FROM STATE MOTOR VEHICLE REGISTRATION RECORDS. THE USE OF SUCH MOTOR VEHICLE REGISTRATION DATA FOR ANY OTHER PURPOSE IS A VIOLATION OF LAW IN SEVERAL STATES. ACCORDINGLY, YOU ARE URGED TO LIMIT THE USE OF THIS LISTING TO THIS CAMPAIGN.

SERVICE PROCEDURE:

1. RAISE ENGINE COMPARTMENT HOOD (ON S/T TRUCKS); REMOVE ENGINE COVER (ON M/L VANS).

2. REMOVE PCV VALVE FROM THE VALVE COVER.

3. REMOVE THE PCV VALVE FROM THE VENTILATION HOSE.

4. INSTALL NEW PCV VALVE TO THE VENTILATION HOSE.

5. INSTALL NEW PCV VALVE TO VALVE COVER.

6. INSTALL "CAMPAIGN IDENTIFICATION LABEL."

7. LOWER ENGINE COMPARTMENT HOOD (ON S/T TRUCKS); INSTALL ENGINE COVER (ON M/L VANS).

PARTS INFORMATION

PARTS ARE TO BE OBTAINED FROM GENERAL MOTORS SERVICE PARTS OPERATION (GMSPO). TO ENSURE PARTS ARE OBTAINED AS SOON AS POSSIBLE, ORDER THEM FROM GMSPO ON A C.I.O. ORDER WITH NO SPECIAL INSTRUCTION CODE BUT ORDER UNDER AN ADVISE CODE (2).

PART NUMBER DESCRIPTION QUANTITY 6487532 VALVE-PCV 1 (1992/1993) M/L & S/T 6487779 VALVE-PCV (1994) M/L 1 & S/T

WARRANTY INFORMATION

DEALERS SHOULD SUBMIT A WARRANTY CLAIM ON EACH VEHICLE COMPLETED UNDER THIS CAMPAIGN.

LABOR OPERATION *TIME PARTS TROUBLE NUMBER DESCRIPTION ALLOWANCE ALLOWANCE CODE INSTALL NEW V8430 PCV VALVE 0.5 HRS. ** 96 (1992-93 M/L) INSTALL NEW V8431 PCV VALVE 0.5 HRS. ** 96 (1994 M/L) INSTALL NEW V8432 PCV VALVE 0.2 HRS. ** 96 (1992-93 S/T) INSTALL NEW V8433 PCV VALVE 0.2 HRS. ** 96 (1994 S/T)

* FOR DEALER TO RECEIVE ADMINISTRATIVE TIME ALLOWANCE ASSOCIATED WITH THIS CAMPAIGN, ADD 0.1 HOUR TO THE LABOR OPERATION TIME ALLOWANCE.

** THE AMOUNT IDENTIFIED IN THE "PARTS ALLOWANCE" COLUMN ABOVE REPRESENTS (30% FOR 1992-93 VEHICLES AND 40% FOR 1994 VEHICLES) OF DEALER NET FOR PARTS THAT ARE FURNISHED IN THIS CAMPAIGN. THIS AMOUNT IS TO BE PLACED IN THE NET ITEM AMOUNT COLUMN OF THE CLAIM AND TYPE CODE "M."

CAMPAIGN IDENTIFICATION LABEL

EACH VEHICLE CORRECTED IN ACCORDANCE WITH THE INSTRUCTIONS OUTLINED IN THIS PRODUCT CAMPAIGN BULLETIN WILL REQUIRE A "CAMPAIGN IDENTIFICATION LABEL." EACH LABEL PROVIDES A SPACE TO INCLUDE THE CAMPAIGN NUMBER AND FIVE (5) DIGIT DEALER CODE OF THE DEALER PERFORMING THE CAMPAIGN SERVICE. THIS INFORMATION MAY BE INSERTED WITH A TYPEWRITER OR BALL POINT PEN.

EACH "CAMPAIGN IDENTIFICATION LABEL" IS TO BE LOCATED ON THE RADIATOR CORE SUPPORT IN AN AREA WHICH WILL BE VISIBLE WHEN THE VEHICLE IS BROUGHT IN FOR PERIODIC SERVICING BY THE OWNER.

APPLY "CAMPAIGN IDENTIFICATION LABEL" ONLY ON A CLEAN, DRY SURFACE.

ADMINISTRATIVE PROCEDURE

PROCEDURES COVERING THIS CAMPAIGN ARE OUTLINED IN SECTION V OF YOUR DEALERSHIP'S "(DIVISION) WARRANTY CLAIMS PROCESSING MANUAL" #P9119.

1994 GENERAL MOTORS CORPORATION, ALL RIGHTS RESERVED.

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO IMFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETINS APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.

DEAR GM TRUCK OWNER:

GENERAL MOTORS HAS DETERMINED THAT CERTAIN 1992-94 SAFARI VANS, S/T JIMMY UTILITY VEHICLES AND SONOMA PICKUP TRUCKS EQUIPPED WITH 4.3L V6 (RPO L35) ENGINES USED IN ALASKA AND CANADA MAY EXHIBIT ICE BUILDUP IN THE POSITIVE CRANKCASE VENTILATION (PCV) SYSTEM IF OPERATED BELOW -22F (-30C).

THIS CONDITION MAY CAUSE ENGINE OIL LEAKS THROUGH THE DIPSTICK TUBE AND/OR REAR MAIN SEAL. ENGINE FAILURE MAY RESULT IF THE VEHICLE IS DRIVEN WITH THIS CONDITION.

TO CORRECT THIS CONDITION, DEALERS ARE TO REPLACE THE POSITIVE CRANKCASE VENTILATION (PCV) VALVE WITH A HIGHER FLOW CALIBRATED VALVE.

INSTRUCTIONS FOR PERFORMING THIS SERVICE HAVE BEEN SENT TO YOUR (DIVISION) TRUCK DEALER, AND PARTS ARE AVAILABLE. PLEASE CONTACT YOUR DEALER TO ARRANGE A SERVICE DATE AS SOON AS POSSIBLE. THIS PROCEDURE WILL TAKE ABOUT 15 TO 30 MINUTES TO COMPLETE, BUT YOU SHOULD ASK HOW MUCH ADDITIONAL TIME YOUR DEALER WILL NEED TO SCHEDULE AND PROCESS YOUR VEHICLE.

YOUR (DIVISION) TRUCK DEALER IS BEST EQUIPPED TO PROVIDE SERVICE TO ENSURE YOUR VEHICLE IS CORRECTED AS PROMPTLY AS POSSIBLE. HOWEVER, IF YOU TAKE YOUR VEHICLE TO YOUR DEALER ON THE AGREED SERVICE DATE AND THEY DO NOT SERVICE THIS CONDITION ON THAT DATE OR WITHIN FIVE DAYS, WE RECOMMEND YOU CONTACT (DIVISION) CUSTOMER RELATIONS. CONSUMER RELATIONS WILL ASSIST YOU AND YOUR DEALER IN GETTING YOUR VEHICLE CORRECTED. THE TELEPHONE NUMBER OF THE CONSUMER RELATIONS OFFICE IS LISTED IN YOUR WARRANTY AND OWNER ASSISTANCE INFORMATION MANUAL.

AFTER CONTACTING YOUR (DIVISION) DEALER AND THE (DIVISION) CONSUMER RELATIONS OFFICE, IF YOU ARE STILL NOT SATISFIED THAT WE HAVE DONE OUR BEST TO REMEDY THIS CONDITION WITHOUT CHARGE WITHIN A REASONABLE TIME, YOU MAY WISH TO WRITE THE ENVIRONMENTAL PROTECTION DIVISION (EN-340F), UNITED STATES ENVIRONMENTAL PROTECTION AGENCY, 401 M STREET, S.W., WASHINGTON, D.C. 20460. TO ENSURE YOUR FULL PROTECTION UNDER THE EMISSION WARRANTY MADE APPLICABLE TO YOUR VEHICLE BY FEDERAL LAW, AND YOUR RIGHT TO PARTICIPATE IN FUTURE RECALLS, IT IS RECOMMENDED THAT YOU HAVE YOUR VEHICLE SERVICED AS SOON AS POSSIBLE. FAILURE TO DO SO COULD LEGALLY BE DETERMINED TO BE LACK OF PROPER MAINTENANCE OF YOUR VEHICLE. ALSO, YOUR VEHICLE MAY FAIL A STATE OR LOCAL EMISSION INSPECTION TEST IF THE RECALL WORK IS NOT ACCOMPLISHED.

SHOULD YOUR DEALER FIND THAT YOUR EMISSION SYSTEM HAS BEEN INTENTIONALLY DISABLED, YOU WILL BE ASKED IF YOU WISH THE SYSTEM TO BE RESTORED SO THAT IT WILL FUNCTION AS DESIGNED. THE COST OF SUCH RESTORATION WILL BE YOUR RESPONSIBILITY.

THE ENCLOSED POSTAGE PAID OWNER REPLY CARD IDENTIFIES YOUR VEHICLE. PRESENTATION OF THIS CARD TO YOUR DEALER WILL ASSIST IN MAKING THE NECESSARY CORRECTION TO YOUR VEHICLE IN THE SHORTEST POSSIBLE TIME. IF YOU HAVE SOLD OR TRADED YOUR VEHICLE, PLEASE FURNISH US THE COMPLETE NAME AND ADDRESS OF THE PERSON YOU SOLD OR TRADED YOUR VEHICLE TO AND RETURN THE CARD TO US.

ALSO, ENCLOSED IS AN INFORMATION STICKER FOR YOUR VEHICLE'S OWNER'S MANUAL. THIS STICKER SHOULD BE PLACED ON THE PAGE IN SECTION 6, "SERVICE AND APPEARANCE CARE," THAT HAS THE "SERVICE REPLACEMENT PART AND FILTER RECOMMENDATIONS," TO AVOID IMPROPER PCV VALVE USAGE AT ANY TIME IN THE FUTURE.

WE ARE SORRY TO CAUSE YOU THIS INCONVENIENCE; HOWEVER, WE HAVE TAKEN THIS ACTION IN THE INTEREST OF YOUR CONTINUED SATISFACTION WITH OUR PRODUCT.

GENERAL MOTORS CORPORATION

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