CAMPAIGN: PWR. STG. HOSE INADEQUATE THREAD ENGAGEMENT

SUBJECT: POWER STEERING HOSE INADEQUATE THREAD ENGAGEMENT

MODELS: 1900 C6H-C7H TOPKICK/KODIAK TRUCKS

General Motors has determined that certain 1990 C6H-C7H TopKick/Kodiak medium trucks may have inadequate thread engagement between the power steering pump and the power steering gear high pressure hose. This may result in stripped tube nuts on the gear inlet hose assemblies, allowing a slight power steering fluid leak and eventual loss of power steering assist.

To correct this condition, it will be necessary to replace the power steering pump hose assembly with a new hose assembly.

VEHICLES INVOLVED

Involved are certain 1990 C6H-C7H TopKick/Kodiak medium trucks. VINs and servicing dealers (codes) are listed below:

DEALER VIN

48-26397 1GDL7H1JXL600940 48-53184 1GDL7H1J5LJ600957 48-50156 1GDL7H1J4LJ600965 48-40001 1GDJ7H1J7LJ600983 48-26397 1GDL7H1J7LJ600989 48-50005 1GDL7H1J5LJ601011 48-50156 1GDL7H1J4LJ601016 48-18114 1GDL7H1J9LJ601030 48-30159 1GDL6H1J9LJ601032 48-18084 IGDG7H1J7LJ601044 48-06052 1GDL7H1J4LJ601047 48-53256 1GDL7H1JlLJ601054 48-30159 1GDG6H1J7LJ601077 48-10266 1GDL7H1J4LJ601081 48-53451 1GDL6H1J8LJ601085 48-30557 1GDL7H1J8LJ601133

48-44108 1GDL7H1J2LJ601175 48-26231 1GDJ7H1J9LJ601181

48-30276 1GDL7H1J3LJ601198 48-30276 1GDL7H1J2LJ601211 48-53574 1GDL7H1J4LJ601212 48-21686 1GDL7H1J6LJ601213 48-47273 1GDL7H1J3LJ601217 48-10001 1GDL6H1J9LJ601225 48-47273 1GDL7H1J9LJ601254 48-50148 1GDL7H1J7LJ601270 48-42076 1GDJ6H1JXLJ601273 48-50148 1GDL7H1J4LJ601274 48-42076 1GDJ6H1J9LJ601278 48-21686 1GDL7H1JXLJ601280 48-53528 1GDL7H1JOLJ6Ol286 48-42076 1GDJ6H1J3LJ601311 48-50148 1GDL6H1J5LJ601321 48-42076 1GDJ6H1JlLJ601338 48-42076 1GDJ6H1J5LJ601391 48-50148 1GDL6H1J3LJ601396

13-16459 1GBL7H1J9LJ200537 13-16459 1GBJ7H1J6LJ200583 13-26424 1GBL7H1J3LJ200615 13-26424 1GBL7H1J7LJ200617 13-15018 1GBL7H1J1LJ200631 13-17117 1GBL7H1J7LJ200634 13-26350 1GBL7H1J9LJ200635 13-16778 1GBL7H1J4LJ200641 13-04641 1GBG7H1J4LJ200642 13-26424 1GBL7H1J9LJ200649 13-16420 1GBL7H1J0LJ200653

13-04641 1GBG7H1J0LJ200668 13-16780 1GBL7H1J2LJ200671 13-08720 1GBL7H1J4LJ200672 13-15146 1GBL7H1JXLJ200692 13-04641 1GBE6H1J2LJ200701 13-08520 1GBL7H1J5IJ200714 13-17349 1GBJ6H1J8LJ200720 13-26144 1GBL7H1JXW200739 13-00520 1GBL7H1JXLJ200742 13-16503 1GBL7H1J0LJ200748 13-09903 1GBJ7H1J5LJ200770 13-09227 1GBL7H1J8LJ200772 13-15655 1GBL7H1J4LJ200803 13-20088 1GBL7H1J4LJ200834

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. 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 are to be contacted by the dealer and arrangements made to make the required cor- rection according to instructions contained in this bulletin.

If no owner's name and address were available to GMC Truck Division 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 Division General Motors Corporation 101 Union Street Plymouth, Michigan 48170

OWNER NOTIFICATION

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

Service procedure for installation of the new hose assembly is described in the 1990 TopKick/Kodiak Medium Truck Service Manual, X-9033. Reference Section 3B1, Power Steering, for hose assembly replacement and proper hydraulic system bleeding.

PARTS INFORMATION

A new power steering high pressure hose for each vehicle involved will be shipped to involved dealers by GMC Truck on a no charge basis.

If additional hoses are required, they may be obtained by contacting Adistra Corporation (313) 455-9072.

DO NOT ORDER THIS PART FROM GENERAL MOTORS SERVICE PARTS OPERATION (GMSPO).

PART NUMBER DESCRIPTION QUANTITY ----------- ------------------------- --------- 15670950 Power Steering Hose Assembly 1

WARRANTY INFORMATION

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

LABOR OPERATION * TIME PARTS TROUBLE NUMBER DESCRIPTION ALLOWANCE ALLOWANCE CODE ------ ----------- ---------- --------- -------- V5790 Replace Power 1.1 Hr. $5.77 96 Steering Hose Assembly

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

The $5.77 amount identified in the "Parts Allowance" column above represents 30% of dealer net for parts that were furnished by GMC Truck Division. This amount is to be placed in the Net Item Amount column of the claim and use 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 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 dean, dry surface.

ADMINISTRATIVE PROCEDURE

Procedures covering this campaign are outlined in Section V of your dealership's "GM Truck Claims Processing Manual " #P 8919.

Dear GM Owner:

General Motors has determined that certain 1990 C6H-C7H TopKick/Kodiak medium trucks may have inadequate thread engagement between the power steering pump and the power steering gear high pressure hose. This may result in stripped tube nuts on the gear inlet hose assemblies, allowing a alight power steering fluid leak and eventual loss of power steering assist.

To correct this condition, it will be necessary to replace the power steering pump hose assembly with a new hose assembly. This service will be provided for you at no charge.

Please contact your GM Truck dealer as soon as possible to arrange a service date. Instructions for making this correction have been sent to your dealer. Please ask your dealer if you wish to know how much time will be needed to schedule, process and repair your vehicle.

The enclosed postage paid owner reply card identifies your vehicle. Presentation of this card to your dealer will assist in mailing the necessary correction to your vehicle in the shortest possible time. If you have sold or traded your vehicle, please furnish us complete name and address of the person you sold or traded your vehicle to and return the card 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.

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.