Customer Satisfaction - Engine Oil Cooler Hose Contact

General Motors has decided that certain 2001 Chevrolet and GMC S pickup trucks built at Shreveport Assembly Plant and equipped with a V6 engine (L35) may have been built with an incorrectly oriented engine oil cooler hose. If the oil cooler hose contacts the rotating engine crankshaft pulley, the rubbing action may create a hole in the hose resulting in an engine oil leak from the hose.

Dealers are to inspect the oil cooler hose to ensure the proper orientation, and reorient the hose if necessary. In addition, dealers are to inspect for damage of the hose, and install a new hose, if damage is found.

Involved are certain 2001 Chevrolet and GMC S pickup trucks built at Shreveport Assembly Plant, equipped with a V6 engine (L35), and built within these VIN breakpoints:

Important: Dealers should confirm vehicle eligibility through GMVIS (GM Vehicle Inquiry System) prior to beginning campaign repairs. [Not all vehicles within the above breakpoints may be involved.]

Involved vehicles have been identified by Vehicle Identification Number. Computer listings containing the complete Vehicle Identification Number, customer name and address data have been prepared, and are being furnished to involved dealers with the campaign bulletin. The customer name and address data furnished will enable dealers to follow up with customers involved in this campaign. Any dealer not receiving a computer listing with the campaign bulletin has no involved vehicles currently assigned.

These dealer listings may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any other purpose is a violation of law in several states/provinces/countries. Accordingly, you are urged to limit the use of this listing to the follow-up necessary to complete this campaign.

Parts required to complete this campaign are to be obtained from General Motors Service Parts Operations (GMSPO). Please refer to your "involved vehicles listing" before ordering requirements. Normal orders should be placed on a DRO = Daily Replenishment Order. In an emergency situation, parts should be ordered on a CSO = Customer Special Order.

Important: There are 323 vehicles involved nationwide. It is estimated that less than 50% of involved vehicles will require hose replacement. Please order parts accordingly.

1. Raise and suitably support the vehicle.
2. Inspect the engine oil cooler hose for a minimum of 25mm (1 in) clearance between the hose and the crankshaft pulley, and for damage to the hose.

-	If the clearance is less than 25mm (1 in) and the hose is not damaged, proceed to Step 3 and reposition the hose.

-	If the hose is damaged, proceed to the Oil Cooler Hose Replacement Procedure and replace the oil cooler hose.

-	If no damage is found and the clearance is within specification, no further action is required. Install the GM Campaign Identification Label.

3. Remove the bolt attaching the support clamp on the pipes at the engine oil pan and rotate the inboard pipe at the crimped end, by hand, to obtain the minimum clearance of 25mm (1 in).
4. If you are unable to rotate the pipe by hand, wrap the pipe with a rag to protect the coating of the pipe, and rotate the pipe with a pair of pliers to obtain the minimum clearance of 25mm (1 in).
5. Reinstall the support clamp attaching bolt.

Tighten
Tighten the bolt to 10 N·m (89 lb in).

6. Lower the vehicle.
7. Install the GM Campaign Identification Label.

Oil Cooler Hose Replacement Procedure

1. Remove the engine oil cooler lines support clamp bolt.

Important: Have a drain pan ready for the engine oil to drain into.

2. Remove the bolt that attaches the engine oil cooler lines to the oil filter adapter.
3. Hold the cooler lines below the bottom of the radiator to drain the engine oil.
4. Remove and discard the seals.
5. Lower the vehicle.
6. Remove the air cleaner assembly.
7. Remove the engine oil cooler line retaining rings from the quick connectors at the radiator. Using a bent-tip screwdriver or equivalent, pull on one of the open ends of the retaining rings in order to rotate it. Rotate around the quick connector until the retaining ring is out of position and can be completely removed. Discard the retaining rings.
8. Remove the engine oil cooler lines from the quick connectors at the radiator. Pull the lines straight out from the connectors.
9. Raise and suitably support the vehicle.
10. Remove the engine oil cooler lines from the vehicle.
11. Install the engine oil cooler lines into the vehicle.
12. Install new seals on the engine oil cooler lines at the oil filter adapter ends.
13. Install the bolt that attaches the engine oil cooler lines to the engine oil filter adapter.

Tighten
Tighten the bolt to 35 N·m (26 lb ft).

14. Install the attaching bolt and the clamp. Maintain a minimum clearance of 25mm (1 in) between the hose and the crankshaft pulley.

Tighten
Tighten the bolt to 10 N·m (89 lb in).

15. Lower the vehicle.

Important: Do not install the new retaining ring onto the fitting by pushing the retaining ring down over the fitting.

16. Install a new retaining ring into each quick connector at the radiator. Hook one of the open ends of the retaining ring into one of the slots in the quick connector. Rotate the retaining ring around the connector until the ring is positioned with all 3 ears through the 3 slots. Ensure the 3 retaining ring ears can be seen from inside of the connector, and the retaining ring can move freely in the slots.
17. Install the engine oil cooler lines into the quick connectors at the radiator until a click is heard or felt. Pull back on the lines to ensure proper connection.
18. Install the air cleaner assembly.
19. Check and fill the engine oil to the proper level.
20. Start the engine and check for leaks.
21. Install the GM Campaign Identification Label.

Place a Campaign Identification Label on each vehicle corrected in accordance with the instructions outlined in this Product Campaign Bulletin. Each label provides a space to include the campaign number and the five (5) digit dealer code of the dealer performing the campaign service. This information may be inserted with a typewriter or a ball point pen.

Put the Campaign Identification Label on a clean and dry surface of the radiator core support in an area that will be visible to people servicing the vehicle. When installing the Campaign Identification Label, be sure to pull the tab to allow the adhesion of the clear protective covering. Additional Campaign Identification Labels for US dealers can be obtained from Dealer Support Materials by calling 1-888-549-6152 (Monday-Friday, 8:00 am to 5:00 pm EST). Ask for Item Number S-1015 when ordering.

Submit a Product Campaign Claim with the information indicated below.

Refer to the General Motors WINS Claim Processing Manual for details on Product Campaign Claim Submission.

Customers will be notified of this campaign on their vehicles by General Motors (see copy of customer letter included with this bulletin).

All unsold new vehicles in dealers' possession and subject to this campaign MUST be held and inspected/repaired per the service procedure of this campaign bulletin BEFORE customers take possession of these vehicles.

Dealers are to service all vehicles subject to this campaign at no charge to customers, regardless of mileage, age of vehicle, or ownership, from this time forward.

Customers who have recently purchased vehicles sold from your vehicle inventory, and for which there is no customer information indicated on the dealer listing, are to be contacted by the dealer. Arrangements are to be made to make the required correction according to the instructions contained in this bulletin. This could be done by mailing to such customers a copy of the customer letter accompanying this bulletin. Campaign follow-up cards should not be used for this purpose, since the customer may not as yet have received the notification letter.

In summary, whenever a vehicle subject to this campaign enters your vehicle inventory, or is in your dealership for service in the future, you must take the steps necessary to be sure the campaign correction has been made before selling or releasing the vehicle.

Dear General Motors Customer:

We want your experience owning your S pickup truck to be better than any other you've had ... which is why we're writing.

We have learned that your S pickup truck may have been built with an engine oil cooler hose incorrectly oriented. If the oil cooler hose contacts the rotating engine crankshaft pulley, the rubbing action may create a hole in the hose resulting in an engine oil leak from the hose.

Your dealer will inspect your engine oil cooler hose to ensure the proper orientation, and reorient the hose if necessary. In addition, your dealer will inspect for damage of the hose, and install a new hose if damage is found. This service will be performed for you at no charge .

We recommend that you contact your dealer to arrange a service date.

Presenting the attached card to your dealer will assist in making the necessary correction in the shortest possible time.

If you no longer own this vehicle, please check the appropriate box and provide new owner information, if available.

If you have any questions or need any assistance, just contact your dealer or the appropriate Customer Assistance Center at the number listed below:

We sincerely regret any inconvenience this causes you. Also, we want you to know that we will continue to do everything we can to ensure that you are completely satisfied with your S pickup truck and with Chevrolet/GMC.

General Motors Corporation

Enclosure