CAMPAIGN: ENGINE FAN BLADE MAY FAIL (REPLACE)- DIESEL

MODELS: 1982-1985 P35 EOUIPPED WITH RPO LL4 6.2L DIESEL ENGINE, M20 4-SPEED MANUAL TRANSMISSION AND HC4 4.56 REAR AXLE RATIO

The National Traffic and Motor Vehicle Safety Act, as amended, provides that each vehicle which is subject to a recall campaign of this type must be adequately repaired within a reasonable time after the owner has tendered it for repair. A failure to adequately repair within 60 days after tender of a vehicle is prima facie evidence of failure to repair within a reasonable time.

If the condition is not adequately repaired within a reasonable time, the owner may be entitled to an identical or reasonably equivalent vehicle at no charge, or to a refund of the purchase price less a reasonable allowance for depreciation.

To avoid having to provide these burdensome solutions, every effort must be made to promptly schedule appointments with owners and to repair their vehicles as soon as possible. As you will see in reading the attached copy of the letter which is being sent to owners, the owner is being instructed to contact the nearest GMC Zone Office if the dealer does not remedy the condition within five days of the mutually agreed upon service date. If the condition is not remedied within a reasonable time, they are instructed how to contact the National Highway Traffic Safety Administration.

DEFECT INVOLVED

General Motors has determined that a defect which relates to Motor Vehicle Safety exists in some 1982 through 1985 P35 Model Trucks equipped with LL4 6.2L Diesel Engine, M20 4-speed manual transmission and HC4 4.56 rear axle ratio.

The fan blade assembly installed on the engine in some of these vehicles could be subjected to high stress levels during certain engine operating con- ditions. As a result, the fan blade can fatigue over a period of time and then break apart at the hub while the engine is running. If this occurs while the hood is open, a person working under the hood of the vehicle or in the vicinity of the vehicle could be struck by the blade segment and injured.

VEHICLES INVOLVED

Involved are certain 1982 through 1985 P35 Model Trucks equipped with LL4 6.2L Diesel Engine, M20 4-speed manual transmission and HC4 4.56 rear axle ratio built within the following VIN breakpoints:

Plant Year From Through ----- ---- ---- ------- Detroit 1982 C3501698 C3504763 1983 D3500004 D3503774 1984 E3501252 E3505492 1985 F3500688 F3509522

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.

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.

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 be sure the campaign correction has been made before reselling or releasing the vehicle.

Owners of vehicles recently sold from your new vehicle inventory are to be contacted by the dealer, and arrangements made to make the required modification according to instructions contained in this bulletin.

If no owner's name and address were available to GMC Truck at the time of campaign initiation, the dealer will 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 General Motors Corporation 101 Union Street Plymouth, Michigan 48170

OWNER NOTIFICATION

Owners will be notified of this campaign on their vehicles by GMC Truck (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

Remove fan blade assembly and replace with new assembly Part Number 22512599. Follow Service Procedure as outlined in the 1985 GMC Light Duty Truck Service Manual X8532, Section 6B-18.

PARTS INFORMATION

Parts are to be obtained from the Warehousing and Distribution Division of General Motors (WDDGM). To ensure that these parts will be obtained as soon as possible, they should be ordered from WDDGM on a C.I.O. order with NO special instruction code but order under an advise code (2).

Qty. Part Per Number Description Vehicle ------- ----------- ------- 22512599 Fan Blade Assembly 1

WARRANTY INFORMATION

Dealers should submit an accurately filled out Warranty Repair Order on each vehicle completed under this campaign.

Labor *Time Operation Allow- Trouble Number Description ance Code ------ ----------- ---- ---- V2960 Replace Fan Blade 0.5 HRS. 96 Assembly

*For dealer to receive Administration Time Allowance associated with this campaign, add 0.1 hour to the Labor Operation Time Allowance.

CAMPAIGN IDENTIFICATION LABEL

Each vehicle modified 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 five (5) digit Dealer Code of the dealer performing the campaign service. This information may be inserted with a typewriter or ballpoint 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 "GMC Truck Claims Processing Manual" #SD8519.

Dear GMC Truck Owner:

This notice is sent to you in accordance with the requirements of the National Traffic and Motor Vehicle Safety Act.

General Motors has determined that a defect which relates to motor vehicle safety exists in some 1982 through 1985 P35 Model Trucks equipped with a 6.2L Diesel Engine, 4-speed manual transmission and a 4.56 rear axle ratio. The fan blade assembly installed on the engine in some of these vehicles could be subjected to high stress levels during certain engine operating conditions. As a result the fan blade can fatigue over a period of time and then break apart at the hub while the engine is running. If this occurs while the hood is open, a person working under the hood of the vehicle or in the vicinity of the vehicle could be struck by the blade segment and injured.

To prevent the possibility of a fan blade failure on your vehicle, please contact your GMC dealer on or after the date shown below to arrange a service date. Your dealer will replace the engine fan on your vehicle at no charge to you. Until your vehicle has been corrected do not allow any person to run the engine of your vehicle when the hood is open.

Instructions for making this correction have been sent to your GMC Truck Dealer. It is estimated that parts will be available on October 25, 1985. The labor time necessary to correct your vehicle is 30 minutes. Please ask your dealer if you wish to know how much additional time will be needed to process your vehicle.

Your GMC Truck Dealer is best equipped to obtain parts and 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 remedy this condition on that date or within five days, we recommend you contact the nearest GMC Truck Zone Office, either in person or by telephone. The Zone Office will assist you and the dealer in getting your vehicle corrected. The locations and telephone numbers of the Zone Offices are listed in your Owner's Manual.

After contacting your dealer and the Zone Office, if you are still not satisfied that we have done our best to remedy this condition without charge and within a reasonable time, you may wish to write the Administrator, National Highway Traffic Safety Administration, 400 Seventh Street, S.W., Washington, D.C. 20590 or call 800-424-9393 (Washington, D.C. residents use 426-0123).

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 owner 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 safety and continued satisfaction with our products.

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.