CAMPAIGN: ENGINE FAN FAILURES INSTALL NEW DESIGNED ASSEMBLY. GMC Truck S15 Pickup - 2WD 1989

For 1990-2009 cars

# CAMPAIGN: ENGINE FAN FAILURES INSTALL NEW DESIGNED ASSEMBLY

#### SUBJECT: NON - A/C ENGINE FAN FAILURE

#### MODELS: 1989-92 S 10 Pickup Trucks With 2.5L Engines And Without Air Conditioning

TO. ALL GENERAL MOTORS DEALERS

General Motors of Canada Limited has determined that a defect which relates to motor vehicle safety exists in certain 1989-92 S10 Pickup Trucks equipped with 2.5L engines (RPO's LN8 or L38) and without air conditioning (RPO C42). These vehicles may exhibit fan blade breakage as a result of fatigue caused by engine and/or vehicle induced stress. 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 this condition occurring, dealers are to install a newly designed fan assembly with longer fasteners.

#### VEHICLES INVOLVED:

Involved are certain 1989-92 S 10 Pickup Trucks equipped with 2.5L engines (RPO's LN8 or L38) and without air conditioning (RPO C42) model vehicles built within the following VIN breakpoints:

PLANT YEAR MODEL PLANT CODE FROM THROUGH ---- ----- ----- ----- ---- ------- 1989 CHEV Moraine "2" K2100001 K2280255 " GMC " " K2500001 K2545147 1989 CHEV Shreveport "8" K8100043 K8256110 " GMC " " K8500001 K8539143 1990 CHEV Moraine "2" L2100009 L2153307 " GMC " " L2500001 L2515348 1991 CHEV Pontiac West "0" M0119593 M0212614 " GMC " " M0504384 M0534713 1991 CHEV Moraine "2" M2100003 M2325890 " GMC " " M2500016 M2561521 1991 GMC Shreveport "8" M8500007 M8552776 1992 CHEV Pontiac West "0" N0100001 N0111321 " GMC " " N0500001 N0504132 1992 CHEV Moraine "2" N2100067 N2124799 " GMC " " N2500001 N2507297

All affected vehicles have been identified by the VIN listing provided to involved dealers with this bulletin. Any dealer not receiving a listing was not shipped any of the affected vehicles.

#### DEALER CAMPAIGN RESPONSIBILITY

All unsold vehicles in dealer's 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 perform this campaign on all involved vehicles at no charge to owners, regardless of kilometres traveled, 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. 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.

In summary, whenever a vehicle subject to this campaign is taken into your. new or used 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.

#### CAMPAIGN PROCEDURE:

Refer to Section 4 of the Service Policies and Procedures Manual for the detailed procedure on handling Product Campaigns. Dealers are requested to complete the campaign on all transfers as soon as possible.

#### OWNER NOTIFICATION:

All owners of record at the time of campaign release are shown on the attached computer listing and have, been notified by first class mail from General Motors (see copy of owner letter included with this bulletin). The listings provided are for campaign activity only and should not be used for any other purpose.

#### PARTS INFORMATION:

Parts required to complete this campaign should be ordered through regular channels, as follows:

Part Number Description Quantity/Vehicle ----------- ----------- ---------------- 15958125 Fan Blade Assembly Kit 1

PARTS AND LABOR CLAIM INFORMATION:

Credit for the campaign work performed will be paid upon receipt of a properly completed campaign claim card or DCS transmission in accordance with the following:

Repair Code Description Time Allowance ----------- ----------- -------------- 2A Install Fan Blade Assembly Kit 0.5

Time allowance includes 0.1 hour for dealer administrative detail associated with this campaign. Parts credit will be based on dealer net plus 30% to cover parts handling.

#### SERVICE PROCEDURE:

1. Disconnect negative battery cable.

2. Remove upper fan shroud.

3. Remove fan and clutch assembly by removing the four (4) nuts (Figure 1, 7).

4. Remove fan from clutch by removing the four (4) bolts (Figure 1, 4). Bolts and fan will not be reused.

#### Notice: Inspect all mounting surfaces for gouges, burrs or other inconsistencies. Mounting surfaces should be clean and flat. Inspect water pump hub runout to ensure it is not bent.

5. Install new fan assembly (Figure 1, 1) to the clutch (Figure 1, 4) using the four (4) new bolts (Figure 1, 2) provided in the kit. Torque bolts to 19 Nm (14 lbs. ft.).

6. Connect fan and fan clutch to pulley (Figure 1, 7). Torque nuts to 24 N.m (17 lbs. ft.).

#### Notice: To maintain a balanced assembly, align yellow paint mark on fan clutch with yellow paint mark on water pump hub (Figure 2).

7. Replace upper fan shroud.

8. Connect negative battery cable.

9. Install Campaign Identification Label.

#### INSTALLATION OF CAMPAIGN IDENTIFICATION LABEL

Clean surface of radiator upper mounting panel and apply a Campaign Identification Label. Make sure the correct campaign number is inserted on the label. This will indicate that the campaign has been completed.

INSERT CAMPAIGN NUMBER

INSERT DEALER CODE

Dear General Motors Customer.

General Motors of Canada Limited has determined that a defect which relates to motor vehicle safety exists in certain 1989-92 S10 Pickup Trucks equipped with 2.5L engines and without air conditioning. These vehicles may exhibit fan blade breakage as a result of fatigue caused by engine and/or vehicle induced stress. 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 this condition occurring, your dealer will install a newly designed fan assembly with longer fasteners.

This service will be provided for you at no charge.

Please contact your GM dealer as soon as possible to arrange a service date.

If parts are required, ask your dealer for details regarding their availability. If parts are not in stock, they can be ordered before scheduling your service date.

This letter identifies your vehicle. Presentation of this letter to your dealer will assist their Service personnel in completing the necessary correction to your vehicle in the shortest possible time.

We are sorry to cause you this inconvenience; however, we have taken this action in the interest of your continued satisfaction with our products.

Customer Support Department General Motors of Canada Limited

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.