CAMPAIGN: EVAPORATIVE CANISTER PURGE THERMO VACUUM SWITCH. GMC Truck Caballero 1983

For 1990-2009 cars

# CAMPAIGN: EVAPORATIVE CANISTER PURGE THERMO VACUUM SWITCH

#### MODELS: 1983 CABALLERO EQUIPPED WITH 3.8L (RPO LC3, VIN CODE 9), OR 5.OL (RPO LG4, VIN CODE H), ENGINES

General Motors has determined that certain 1983 GMC Truck Caballero model vehicles may experience an inoperative canister purge Thermo Vacuum Switch (TVS). An inoperative canister purge TVS can affect the intended function of the evaporative emission system.

To prevent the possibility of this condition occurring, the canister purge TVS will be replaced on all involved vehicles.

#### VEHICLES INVOLVED

Involved are all 1983 GMC Caballero model trucks equipped with 3.8L (RPO LC3, VIN Code 9), or 5.0L (RPO LG4, VIN Code H), engines produced from start-of-production 1983 model year through end-of-production 1983 model year.

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 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 correction 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

If there is evidence of intentional disablement of the evaporative emission system, the dealer is to notify the vehicle owner of this condition and ask if he/she wants the system restored. The cost of such restoration will be the responsibility of the owner.

#### SERVICE PROCEDURE

1. Disconnect negative battery cable.

2. Drain coolant (save in clean container for reuse) to a level just below TVS.

3. Remove air cleaner.

4. Remove canister purge TVS (see illustration).

5. Coat new canister purge TVS (P/N IW55876) with thread sealant (P/N 1052080) and install.

6. Reinstall air cleaner.

7. Refill coolant.

8. Reconnect negative battery cable.

#### PARTS INFORMATION

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 on an advise code (2).

Part Number Description Qty./Veh. ------ ----------- --------- 10055876 Thermo Vacuum Switch 1

To ensure parts availability upon initial owner request for vehicle correction, dealers are encouraged to order parts, based on attached involved vehicle listings, upon receipt of this bulletin.

#### WARRANTY INFORMATION

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

Labor Operation *Time Trouble Number Description Allowance Code ------ ----------- --------- ---- V4240 Replace Therrno .3 Hr. 96 Vacuum Switch

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

#### ADMINISTRATIVE PROCEDURE

Procedures covering this campaign are out-lined in Section V of your dealership's "GMC Truck Claims Processing Manual" #P 8719.

GMC TRUCK CUSTOMER ASSISTANCE REPRESENTATIVES

Use the phone number and address listing below to contact GMC Truck Customer Assistance Representatives. Refer to the map on page 20 to determine your geo- graphic area. When writing use the mail code assigned to your area.

GMC Truck Customer Service Department Mail Code 31 Judson Street Pontiac, MI 48058

Geographic Area Telephone No. Mail Code --------------- ------------- --------- A (415) 498-5225 1606-06 B (805) 373-9521 1606-06 C (303) 740-7913 1606-08 D (214) 659-5154 1606-07 E (913) 451-4173 1606-08 F (312) 961-6465 1606-03 G (713) 591-0804 1606-07 H (313) 456-3553 1606-03 I (201) 993-4065 1606-04 J (301) 258-1480 1606-04 K (901) 756-3453 1606-05 L (404) 257-3666 1606-05

#### NOTE: Residents of Alaska and Hawaii should call GMC Truck Customer Service Department (313) 456-4547 or write to the address above without Mail Code.

TELEPHONE NUMBERS ARE TO CUSTOMER ASSISTANCE REPRESENTATIVES

Dear GMC Truck Owner:

General Motors has determined that your 1983 GMC Truck may experience an inoperative canister purge Thermo Vacuum Switch (TVS). An inoperative canister purge TVS can affect the intended function of the evaporative emission system on your vehicle.

To prevent the possibility of this condition occurring, the canister purge TVS will be replaced. This service will be completed for you at no charge.

Instructions for making this correction have been sent to your GMC Truck dealer. Please contact your dealer to arrange a service date. The labor time necessary to perform this service is approximately twenty (20) minutes. Please ask your dealer if you wish to know how much additional time is needed to process your vehicle.

Should your dealer not schedule a service date within a reasonable time, you should contact your GMC Truck Zone Office by telephone for assistance. The telephone numbers of the Zone Offices are attached for your convenience.

If your dealer or GMC Truck Zone Office is unable to remedy this condition within a reasonable time, you may wish to advise the Environmental Protection Agency, at the following address: Director, Manufacturers Operations Division (EN-340F), United States Environmental Protection Agency, 401 M Street, S.W., Washington, D.C. 20460. To ensure your full protection under the emission warranty made applicable to your vehicle by Federal Law, and your right to participate in future recalls, it is recommended that you have your vehicle serviced as soon as possible. Failure to do so could legally be determined to be lack of proper maintenance of your vehicle. Also, your vehicle may fail a state or local emission inspection test if this recall work is not accomplished.

Should your dealer find that your evaporative emission system has been intentionally disabled, you will be asked if you wish the system to be restored so that it will function as designed. The cost of such restoration will be your responsibility.

The enclosed owner reply card identifies your vehicle. Presentation of this card to your dealer will assist in making the necessary correction to your vehicle 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 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.