COOLING FAN RUNS AFTER VEHICLE IS SHUT OFF(INSTALL DIODE KIT)

VEHICLES AFFECTED: 1988 "A" CARS (BUICK AND OLDS ONLY) WITH 3.8L ENGINE AND V08 OPTION (HEAVY DUTY COOLING)

Condition: The cooling fan may run for 10 minutes when the vehicle is shut off, if the A/C select switch is in any position except "off". Normally, the fan may run for 10 minutes after shut off, but only if the underhood temperatures are very high, and the fan may not start running until 2 to 3 minutes after the key is turned off. If not corrected, this could lead to a run-down battery under certain driving conditions and could shorten battery life.

Cause: A diode was incorrectly eliminated from the relay at SOP 1988. This was corrected in production with the VIN-s:

Oklahoma City J6408425 Oshawa J9307491 Tarrytown JT405862

Correction: Install a diode kit, P/N 12083133, as follows:

1. Disconnect negative battery cable.

2. Remove connector from auxiliary fan relay as shown in Illustration.

3. Remove secondary terminal lock from connector.

4. Remove the tape from both ends of the conduit.

5. Remove brown wire from cavity "D", and cut off existing terminal. Remove wire from protective conduit.

6. Find the loose terminal in the kit. Crimp and solder this terminal to the brown wire.

7. Plug the terminal into the empty cavity of the black connector in the kit.

8. Route the brown lead from the kit thru the conduit and plug into cavity "D" of the relay connector.

9. Retape the conduit with new tape.

10. Tape the connector to the outside of the conduit.

11. Plug the relay connector into the auxiliary fan relay. Reconnect the negative battery cable.

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.