CAMPAIGN: COOLANT LEAK FROM AUXILIARY REAR HOSE ASSY.. Chevrolet Chevy Suburban

MODEL & YEAR: COOLANT LEAK FROM THE AUXILIARY REAR HEATER HOSE ASSEMBLY 1992 C/K SUBURBAN WITH 7.4L ENGINES (L19) AND AUXILIARY REAR HEATER (C36)

IMPORTANT: CAMPAIGN 92C23

RETAIN THIS DCS ADMINISTRATIVE MESSAGE WITH DEALER CAMPAIGN BULLETINS. A DEALER BULLETIN WILL NOT BE PRINTED BY CHEVROLET MOTOR DIVISION.

NOTE: THIS IS WITH FURTHER REFERENCE TO THE 1992 SUBURBAN STOP DELIVERY NOTIFICATION DCS ADMIN 01-175 DATED JUNE 12, 1992. AFTER PERFORMING THE INSTRUCTIONS CONTAINED IN THE SERVICE PROCEDURE SECTION BELOW, INVOLVED

THE OBJECTIVE OF THIS PROGRAM IS TO MAKE THIS SUBURBAN CAMPAIGN AS SMOOTH AS POSSIBLE FOR OUR OWNERS.

THE CHEVROLET CUSTOMER ASSISTANCE CENTER (CAC) WILL BE CONTACTING INVOLVED OWNERS AND DEALERS TO COORDINATE CAMPAIGN REPAIRS ON SOLD AND STOCK UNITS. REPLACEMENT PARTS ARE IN LIMITED SUPPLY. PARTS AVAILABILITY WILL BE UNDER THE CONTROL OF THE CHEVROLET CUSTOMER ASSISTANCE CENTER AND GMSPO BY VIN.

CAC PERSONNEL WILL BEGIN CONTACTING OWNERS ON JULY 14, 1992. THE CONTACTING OPERATION WILL TAKE ABOUT ONE WEEK. OWNERS CONTACTED BY CAC WILL BE ADVISED OF THE RECALL. OWNERS WILL BE ASKED FOR THE NAME OF THE DEALER THEY WISH TO HAVE PERFORM THE RECALL REPAIRS. CAC WILL SUGGEST THE SELLING DEALER PERFORM THE REPAIR. THE SELLING DEALER OR OTHER DEALER SPECIFIED BY THE OWNER WILL THEN BE CONTACTED BY CAC TO SCHEDULE A SERVICE APPOINTMENT AND TO COORDINATE CAMPAIGN PARTS SHIPMENT TO THE DEALER.

AFTER THREE TELEPHONE ATTEMPTS, OWNERS WHO CANNOT BE CONTACTED WILL BE SENT A LETTER FROM CAC ADVISING THEM OF THE ATTEMPTED TELEPHONE CONTACT AND THAT THEY CONTACT THEIR DEALER OR CAC TO MAKE ARRANGEMENTS TO HAVE THE CAMPAIGN PERFORMED.

CAC PERSONNEL WILL ALSO CONTACT INVOLVED DEALERS TO COORDINATE CAMPAIGN PARTS SHIPMENT FOR STOCK UNITS. DEALERS ARE NOT TO ORDER CAMPAIGN PARTS DIRECTLY FROM GMSPO AT THIS TIME.

DEFECT INVOLVED:

GENERAL MOTORS HAS DETERMINED THAT CERTAIN 1992 C/K SUBURBANS EQUIPPED WITH 7.4L ENGINES (L19) AND AUXILIARY REAR HEATER (C36) MAY DEVELOP AN ENGINE COOLANT LEAK FROM THE AUXILIARY REAR HEATER OUTLET HOSE. THE LEAK IS CAUSED BY A HEAT DETERIORATION OF THE HOSE MATERIAL AS A RESULT OF ITS CLOSE PROXIMITY TO THE RIGHT-HAND EXHAUST MANIFOLD. THE LEAK COULD EVENTUALLY RESULT IN A TOTAL LOSS OF ENGINE COOLANT.

TO CORRECT THIS CONDITION DEALERS ARE TO INSTALL A NEW REAR HEATER INLET/OUTLET HOSE ASSEMBLY WITH PROTECTIVE HEAT INSULATION.

VEHICLES INVOLVED:

INVOLVED ARE CERTAIN 1992 C/K SUBURBANS WITH 7.4L ENGINES (L19) AND AUXILIARY REAR HEATER (C36) BUILT WITHIN THE FOLLOWING VIN BREAKPOINTS:

PLANT YEAR MODEL PLANT CODE FROM THROUGH ---- ----- ----- ----- ---- ------- 1992 C/K JANESVILLE "J" SOP NJ345036 20906

THIS CAMPAIGN INVOLVES APPROXIMATELY 900 VEHICLES.

INVOLVED VEHICLES HAVE BEEN IDENTIFIED BY VEHICLE IDENTIFICATION NUMBER COMPUTER LISTINGS. COMPUTER LISTINGS CONTAIN THE COMPLETE VEHICLE IDENTIFICATION NUMBER, OWNER NAME AND ADDRESS DATA, AND WILL BE MAILED TO INVOLVED DEALERS WITH A PAPER COPY OF THIS ADMINISTRATIVE MESSAGE THE WEEK OF JULY 20, 1992. OWNER NAME AND ADDRESS DATA FURNISHED WILL ENABLE DEALERS TO FOLLOW-UP WITH OWNERS INVOLVED IN THIS CAMPAIGN.

THESE LISTINGS 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 THE FOLLOW-UP NECESSARY TO COMPLETE THIS CAMPAIGN.

OWNER NOTIFICATION:

OWNERS WILL BE CONTACTED BY THE CHEVROLET ASSISTANCE CENTER. ADDITIONALLY, OWNERS WILL ALSO BE NOTIFIED BY LETTER OF THIS CAMPAIGN ON THEIR VEHICLES BY CHEVROLET MOTOR DIVISION (SEE COPY OF OWNER LETTER INCLUDED WITH THIS ADMINISTRATIVE MESSAGE).

DEALER CAMPAIGN RESPONSIBILITY:

ALL UNSOLD NEW VEHICLES IN DEALERS' POSSESSION AND SUBJECT TO THIS CAMPAIGN MUST BE HELD AND INSPECTED/REPAIRED PER THE SERVICE PROCEDURE OF THIS CAMPAIGN BULLETIN BEFORE OWNERS TAKE POSSESSION OF THESE VEHICLES.

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.

OWNERS OF VEHICLES RECENTLY SOLD FROM YOUR NEW VEHICLE INVENTORY ARE TO BE CONTACTED BY THE DEALER, AND ARRANGEMENTS MADE TO MAKE THE REQUIRED CORRECTION ACCORDING TO INSTRUCTIONS CONTAINED IN THIS BULLETIN.

IN SUMMARY, WHENEVER A VEHICLE SUBJECT TO THIS CAMPAIGN ENTERS YOUR VEHICLE INVENTORY, OR IS IN YOUR DEALERSHIP FOR SERVICE IN THE FUTURE, PLEASE TAKE THE STEPS NECESSARY TO BE SURE THE CAMPAIGN CORRECTION HAS BEEN MADE BEFORE SELLING OR RELEASING THE VEHICLE.

PART INFORMATION:

PARTS ARE UNDER THE CONTROL OF THE CHEVROLET CUSTOMER ASSISTANCE CENTER AND GMSPO BY VIN. CUSTOMER ASSISTANCE CENTER PERSONNEL WILL CONTACT INVOLVED OWNERS AND DEALERS TO COORDINATE CAMPAIGN PARTS SHIPMENT FOR SOLD AND STOCK UNITS.

PLEASE NOTE THE FOLLOWING PARTS INFORMATION IS PROVIDED FOR REFERENCE ONLY. GMSPO WILL RESTRICT DEALER PARTS ORDERING UNTIL CAC HAS COMPLETED OWNER AND DEALER CONTACT ATTEMPTS (AFTER APPROXIMATELY ONE WEEK).

AFTER JULY 27, 1992, PARTS ARE TO BE OBTAINED FROM GENERAL MOTORS SERVICE PARTS OPERATION (GMSPO). TO ENSURE THAT THESE PARTS WILL BE OBTAINED AS SOON AS POSSIBLE, THEY SHOULD BE ORDERED FROM GMSPO ON A C.I.O. ORDER WITH NO SPECIAL INSTRUCTION CODE BUT ORDER UNDER AN ADVISE CODE (2).

QUANTITY/ VEHICLE PART NUMBER DESCRIPTION ----------- ----------- ---------- 15961911 C-TRUCK AUXILIARY HEATER HOSE ASSY. 1 OR 15961912 K-TRUCK AUXILIARY HEATER HOSE ASSY. 1

SERVICE PROCEDURE:

1. REPLACE THE AUXILIARY HEATER INLET AND RETURN HOSE ASSEMBLY WITH THE NEW DESIGN AUXILIARY HEATER INLET AND HOSE ASSEMBLY FOLLOWING THE PROCEDURE FOUND IN THE 1992 C/K TRUCK SERVICE MANUAL ST375-92 PAGE 1A-21.

NOTE: WITH A CLEAN DRAIN PAN, RETAIN AND REUSE COOLANT DRAINED FROM THE SYSTEM.

2. LOOSEN THE TWO FASTENERS WHICH SECURE THE AIR INTAKE PRE-CLEANER BRACKET TO THE WHEEL WELL. THEY ARE LOCATED INSIDE THE PASSENGER SIDE FRONT WHEEL WELL.

3. LOOSEN THE SINGLE FASTENER WHICH SECURES THE AUXILIARY HEATER PIPE ASSEMBLY TO THE AIR INTAKE PRE-CLEANER BRACKET.

4. BY PULLING/PUSHING/ROTATING THE AUXILIARY HEATER PIPE ASSEMBLY, USE THE RELATIVE MOVEMENT BETWEEN THE LOOSENED COMPONENTS TO MAXIMIZE THE DISTANCE BETWEEN THE AUXILIARY REAR HEATER HOSE ASSEMBLY AND THE EXHAUST MANIFOLD.

5. ONCE THE MAXIMUM DISTANCE IS OBTAINED, HOLD THE POSITION AND RETORQUE THE AIR INTAKE PRE-CLEANER BRACKET FASTENERS TO 18 N.M (159 IN. LBS.) AND THE AUXILIARY HEATER PIPE ASSEMBLY FASTENER TO 18 N.M. (159 IN. LBS.).

6. USING A SHOP SCALE, MEASURE THE DISTANCE BETWEEN THE AUXILIARY REAR HEATER HOSE ASSEMBLY AND THE PASSENGER SIDE EXHAUST MANIFOLD AT THEIR CLOSEST POINT. ONE HALF INCH (1/2") CLEARANCE IS A REQUIRED MINIMUM. IF THE REQUIRED MINIMUM IS NOT OBTAINED REPEAT STEPS 2 THROUGH 6. IF THE REQUIRED MINIMUM IS STILL NOT OBTAINED THE AIR INLET PRE-CLEANER BRACKET AND AUXILIARY HEATER PIPE ASSEMBLY BRACKET CAN BE REMOVED AND THE HOLES IN THE WHEEL WELL AND AUXILIARY HEATER PIPE ASSEMBLY BRACKET CAN BE ELONGATED OR ENLARGED TO ALLOW MORE CLEARANCE.

7. INSTALL A "CAMPAIGN IDENTIFICATION LABEL".

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 THE FIVE (5) DIGIT DEALER CODE OF THE DEALER PERFORMING THE CAMPAIGN SERVICE. THIS INFORMATION MAY BE INSERTED WITH A TYPEWRITER OR A 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. ADDITIONAL "CAMPAIGN IDENTIFICATION LABELS" CAN BE OBTAINED FROM DAC.

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

CLAIM INFORMATION:

SUBMIT A PRODUCT CLAIM WITH THE INFORMATION INDICATED BELOW AFTER JULY 17, 1992.

* REPAIR FAILED PARTS LABOR LAB OTH PERFORMED PC PART NO. ALLOW CC-FC 0P HRS HRS ------------------------------------------------------------------------ REPLACE 1 15961911 ** SK-00 V7630 0.7 0.1 AUXILIARY REAR HEATER HOSE ASSY. C-TRUCK

REPLACE 1 15961912 ** SK-00 V7631 0.7 0.1 AUXILIARY REAR HEATER HOSE ASSY. K-TRUCK

REPLACE 1 15961911 ** SK-00 V7632 0.9 0.1 AUXILIARY REAR HEATER HOSE ASSY. C-TRUCK ENLARGE HOLES IN WHEEL WELL AND AUXILIARY HEATER PIPE BRACKET

REPLACE 1 15961912 ** SK-00 V7633 0.9 0.1 AUXILIARY REAR HEATER HOSE ASSY. K-TRUCK ENLARGE HOLES IN WHEEL WELL AND AUXILIARY HEATER PIPE BRACKET

* CAMPAIGN ADMINISTRATIVE ALLOWANCE.

** THE "PARTS ALLOWANCE" SHOULD BE THE SUM TOTAL OF THE CURRENT GMSPO DEALER NET PRICE PLUS 30% OF ALL PARTS REQUIRED FOR THE REPAIR.

DEALERS WILL AUTOMATICALLY RECEIVE THE CORRECT LABOR TIME AND MATERIAL ALLOWANCE BASED ON THE LABOR OPERATION PERFORMED.

REFER TO THE CHEVROLET CLAIMS PROCESSING MANUAL FOR DETAILS ON PRODUCT CAMPAIGN CLAIM SUBMISSION.

CHEVROLET WILL MAKE AN AUTOMATIC ADJUSTMENT FOR DEALER FLOOR PLAN EXPENSE FOR ALL UNITS SHOWN AS DEALER STOCK AS OF JUNE 12, 1992. AN AMOUNT OF $4.01 PER DAY FOR 16 DAYS AND $2.14 PER DAY FOR THE NEXT 26 DAYS WHICH EQUALS $119.80 FOR 42 DAYS WILL BE CREDITED TO THE DEALER'S OPEN ACCOUNT IN THE MONTH OF AUGUST. THIS REPRESENTS A FULL WHOLESALE FLOOR PLAN REIMBURSEMENT ON AN AVERAGE 1992 SUBURBAN FOR THE PERIOD OF JUNE 12, 1992 THROUGH JULY 24, 1992.

OWNER NOTIFICATION LETTERS WILL BE MAILED APPROXIMATELY ON JULY 23, 1992, TO ALL INVOLVED OWNERS AFTER CAC HAS COMPLETED TELEPHONE CONTACT ATTEMPTS.

DEAR CHEVROLET SUBURBAN OWNER:

THIS NOTICE IS SENT TO INFORM YOU THAT CHEVROLET MOTOR DIVISION IS CONDUCTING A RECALL CAMPAIGN THAT INCLUDES YOUR VEHICLE.

REASON FOR THIS RECALL

WHAT WE WILL DO

TO PREVENT THIS CONDITION FROM OCCURRING, YOUR DEALER WILL INSTALL A NEW REAR HEAT INLET/OUTLET HOSE ASSEMBLY WITH PROTECTIVE HEAT INSULATION. THIS SERVICE WILL BE PERFORMED FOR YOU AT NO CHARGE.

WHAT YOU SHOULD DO

PLEASE CONTACT YOUR CHEVROLET DEALER IF THE CHEVROLET CUSTOMER ASSISTANCE CENTER HAS NOT ALREADY ARRANGED A SERVICE DATE WITH YOU AND YOUR DEALER. INSTRUCTIONS FOR MAKING THIS CORRECTION HAVE BEEN SENT TO YOUR DEALER AND PARTS ARE AVAILABLE. PLEASE ASK YOUR DEALER IF YOU WISH TO KNOW HOW MUCH TIME WILL BE NEED TO SCHEDULE AND PROCESS YOUR VEHICLE.

THE ENCLOSED OWNER REPLY CARD IDENTIFIES YOUR VEHICLE. PRESENTATION OF THIS CARD TO YOUR DEALER WILL ASSIST IN MAKING THE NECESSARY CORRECTION IN THE SHORTEST POSSIBLE TIME. IF YOU HAVE SOLD OR TRADED YOUR VEHICLE, PLEASE LET US KNOW BY COMPLETING THE POSTAGE PAID REPLY CARD AND RETURNING IT TO US.

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

CHEVROLET MOTOR DIVISION GENERAL MOTORS CORPORATION ENCLOSURE

PLEASE COMMUNICATE THIS INFORMATION TO THE DEALER OPERATOR AND YOUR SALES, SERVICE, AND PARTS MANAGER UPON RECEIPT.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform 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 bulletin 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.