Campaign - PCV Valve System Hose Freezes: Overview
GMC NUMBER: 94-E-06GROUP: 6E Engine Emission
DATE: January, 1994
SUBJECT:
PCV VALVE SYSTEM HOSE FREEZE
MODELS:
1992-1994 S/T TRUCKS AND M/L VANS WITH 4.3L ENGINES (RPO L35)
General Motors has determined that CERTAIN 1992-94 S/T trucks and M/L vans equipped with 4.3L engines (L35) used in Alaska or Canada may have Positive Crankcase Ventilation (PCV) system hose freeze-up if operated below -22° F (-30° C). This condition can cause engine oil leaks through the dipstick tube and/or rear main seal. Engine failure may result if the vehicle is driven with this condition.
To correct this condition. dealers are to replace the Positive Crankcase Ventilation (PCV) valve with a higher flow calibrated valve.
VEHICLES INVOLVED
Involved are CERTAIN 1992-94 S/T trucks and M/L vans equipped with 4.3L engines (RPO L35) built within the VIN breakpoints as shown.
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. Dealers should confirm vehicle eligibility through VISS (Vehicle Information Service System) or SERVICENET prior to beginning campaign repains.
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 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 the 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.
If the name and address of the owner of an involved vehicle was unavailable to GMC Truck Division at the time of campaign initiation, the dealer must 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. 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 PROCEDURES
1. Raise engine compartment hood (on S/T trucks); remove engine cover (on M/L vans).
2. Remove PCV valve from the valve cover.
3. Remove the PCV valve from the ventilation hose.
4. Install new PCV valve to the ventilation hose.
5. Install new PCV valve to valve cover.
6. Install "Campaign Identification Label."
7. Lower engine compartment hood (on S/T trucks); install engine cover (on M/L vans).
PARTS INFORMATION
Parts are to be obtained from General Motors Service Parts Operation (GMSPO). To ensure parts are obtained as soon as possible, order them from GMSPO on a C.I.O. order with no special instruction code but order under an advise code (2).
Part Number Description Quantity
6487532 Valve-[1][2]PCV (1992/1993) M/L & S/T 1
6487779 Valve-[1][2]PCV (1994) M/L & S/T 1
WARRANTY INFORMATION
Dealers should submit a warranty claim on each vehicle completed under this campaign.
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 campaign number and 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 Warranty Claims Processing Manual" # P9119.