CAMPAIGN:COOLANT PUMP PULLY. GMC Truck Jimmy

SUBJECT: COOLANT PUMP PULLEY

Models: 1993 Chevrolet/GMC "S" Truck Equipped with 2.8L Engine and Air Conditioning (RPO LL2 and C60)

TO: ALL GENERAL MOTORS DEALERS

General Motors of Canada Limited has determined that certain 1993 Chevrolet/GMC S Truck model vehicles equipped with 2.8L engine and air conditioning may have been produced with a coolant pump pulley that could fail. This could result in loss of accessory drive components including power steering assist, generator and coolant pump. The engine will continue to run, but the driver would be warned of the failure by one or more of the following conditions:

A. Likelihood of underhood noise at time of failure.

B. Generator light on or gauge indicating discharge of battery.

C. Engine temperature light on or gauge reading higher than normal engine temperature.

D. Loss of power steering assist.

To prevent the possibility of this condition occurring, dealers are to replace the coolant pump pulley on all involved vehicles.

VEHICLES INVOLVED:

Involved are certain 1993 Chevrolet/GMC S Truck model vehicles equipped with 2.8L engine (RPO LL2 and C60), 5-speed manual transmission and air conditioning, and built within the following VIN breakpoints:

Year Model Plant Plant Code From Through

1993 S-Truck Shreveport "8" SOP EOP 1993 S-Truck Pontiac West "0" SOP EOP

NOTE: PLEASE CHECK DCS SCREEN 45 OR YOUR V.I.N. LISTING BEFORE PERFORMING CAMPAIGN TO ENSURE THAT THE VEHICLE IS AFFECTED. ONLY AFFECTED VIN'S WILL BE PAID.

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 new 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 kilometers traveled, age of vehicle, or ownership, from this time forward.

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 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 ----------- ----------- ---------------- 24503896 Coolant Pump Pulley 1

PARTS AND LABOUR 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 Replace Coolant Pump Pulley .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. Open hood and install fender cover and disconnect negative battery cable. (Note the radio setting.)

2. Remove the (2) two upper radiator fan shroud attachment bolts.

3. Remove the (4) four fan clutch assembly attachment nuts.

4. Remove accessory drive belt by rotating belt tensioner.

5. Remove coolant pump pulley.

6. Install new coolant pump pulley.

7. Reinstall the fan clutch assembly and torque the (4) four attachment nuts to 24 N.m (17 ft. lbs.).

8. Reinstall accessory drive belt.

9. Reinstall upper radiator fan shroud and torque the (2) two attachment bolts to 10 Nm (90 in. lbs.).

10. Connect battery.

11. Install Campaign Identification Label.

INSTALLATION OF CAMPAIGN .

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.

Dear General Motors Customer:

A. Likelihood of underhood noise at time of failure.

B. Generator light on or gauge indicating discharge of battery.

C. Engine temperature light on or gauge reading higher than normal engine temperature.

D. Loss of power steering assist.

To prevent the possibility of this condition occurring, your dealer will replace the current coolant pump pulley on all involved vehicles.

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.