CAMPAIGN: A/C COMPRESSOR AND CONDENSER HOSE INTERFERENCE

MODELS: 1989 M-VANS WITH AIR CONDITIONING AND 4.3L V6 ENGINES (RPO LB4)

General Motors has determined that 1989 M-Vans equipped with air conditioning (RPO C60/C69) and 4.3L V6 Engines (LB4) may have the high pressure A/C line (A/C compressor and condenser hose assembly) contacting the positive stud boot on the rear of the generator. If this line causes the stud to push through the boot and contact the line, arcing can occur, causing a hole in the line and total loss of A/C refrigerant.

To correct this condition, it will be necessary to inspect the line for necessary clearances or damage. If no damage has occurred, the line will be relocated. If damage has occurred, a new A/C line must be installed and relocated. An estimated 10% of the vehicles involved will require a new A/C line and recharge.

VEHICLES INVOLVED

Involved are 1989 M-Vans built within the following VIN breakpoints:

Model Year Model Plant From Through ---- ----- ----- ---- ------- 1989 M-Vans Baltimore KB507819 KB508474

The specific vehicles involved in this campaign have been identified by Vehicle Identification Number Computer Listings. These listings are firnished 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 vehides recently sold from your new vehicle inventory are to be contacted by the dealer and arrangementsmadetomaketherequiredcorrectionac- cording 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 PROCEDURE

Disconnect positive battery lead.

Remove the engine cover and extension housing.

Inspect the A/C compressor and condenser hose assembly to insure it does NOT contact the protruding battery connection stud/rubber boot on the back of the generator, and has a minimum of 1/2" clearance. Other possible contact points are the engine lift bracket, the brake vacuum booster, the upper radiator hose or cowling. (Figure 1) If the hose assembly is touching any of these areas, determine if it needs to be relocated or replaced due to wear contact.

If the hose assembly needs relocating, carefully move/pull it away from the interference contact point.

If the hose assembly is damaged due to wear contact, perform the following replacement procedures:

1. Evacuate the A/C system. Refer to the 1989 Light Duty Truck Service Manual, Air Conditioning Section-lB Evacuating and Charging Procedures.

2. Remove the A/C accumulator suction hose, discharge hose, and the A/C compressor and condenser hose assembly.

3. Replace the damaged hose assembly using P/N 15571272 for vehicles equipped with front A/C only (RPO C60) and P/N 15571273 for vehicles equipped with front and rear A/C (RPO C69).

4. Inspect the A/C compressor and condenser hose assembly for adequate clearances as described above and relocate as necessary. (Figure 1)

5. Reinstall the discharge hose and A/C accumulator suction hose.

6. Install the engine cover.

7. Evacuate and recharge the A/C system.

8. Reconnect the positive battery lead.

PARTS INFORMATION

Parts are to be obtained from General Motors Service Parts Operation (GMSPO). It is estimated that only 10% of the vehicles involved will require a new hose assembly. 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 under an advise code (2).

Part No. Description Qty. -------- ----------- --- 15571272 A/C Compressor & Condenser Hose 1 Assembly for vehicles equipped with Front A/C Only (RPO C60)

15571273 A/C Compressor & Condenser Hose 1 Assembly for vehicles equipped with Front and Rear A/C (RPO C69)

WARRANTY INFORMATION

Dealers should submit a warranty claim on each vehicle completed under this campaign.

Labor Oper. *Time **Parts Trouble No. Description Allowance Allowance Code ---- ------------ --------- --------- ---- V4970 Inspect A/C Hose 0.4 hr 96 Assembly for Clearance and Relocate as necessary

V4971 Inspect A/C Hose 1.2 hr 96 Assembly for Clearance, Replace and Relocate - With Front A/C Only $6.64 (RPO C60) - With Front & Rear A/C $11.06 (RPO C69)

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

**This amount is to be entered as a net item to pay for the refrigerant required to recharge the A/C system. Includes 30% 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 outlined in Section V of your dealership's "GMC Truck Claims Processing Manual" #P 8719.

Dear GMC Truck Owner

This notice is sent to inform you that GMC Truck Division is conducting a recall campaign that includes your vehicle.

REASON FOR THIS RECALL

General Motors has determined that 1989 GMC Truck M Vans equipped with air conditioning (RPO C60/C69) and 4.3L V6 Engines (RPO LB4) may have the high pressure A/C line (A/C compressor and condenser hose assembly) contacting the positive stud boot on the rear of the generator. If this line causes the stud to push through the boot and contact the line, arcing can occur, causing a hole in the line and total loss of A/C refrigerant.

WHAT WE WILL DO

To prevent die possibility of this condition occurring, it will be necessary to inspect the line for necessary clearances or damage. If no damage has occurred, a new A/C line will be installed and relocated. This service will be performed for you at no charge.

WHAT YOU SHOULD DO

Please contact your GMC Truck dealer as soon as possible to arrange a service date. Instructions for making this correction have been sent to your dealer. The labor time necessary to perform this inspection and/or correction may vary from ten minutes to one hour, depending on the amount of service required for your vehicle. Please ask your dealer if you wish to know how much additional time will be needed to schedule and process your vehicle.

The enclosed owner reply card identifies your vehicle. Presentation of this card to your dealer will assist in making the necessary inspection/correction in the shortest possible time. If you have sold or traded your vehicle, please let us know by completing the postage paid reply card and rewming 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.