COOLING FAN PROBLEMS AND A/C PRESSURE TOO HIGH BCM CODES

VEHICLES AFFECTED: 1986 Eldorado and Seville

Some 1986 Eldorados and Sevilles may experience a history or current code B441 (cooling fans problem) and/or B449 (A/C high side temperature too high) caused by corrosion of an in-line fuse. The in-line fuse is taped to the bottom of the harness between the windshield washer solvent reservoir and the underhood relay centre, as shown in Figure 1. The corrosion is suspected to be the result of windshield washer solvent spillage on to the harness and leaking into the fuse holder.

The 10-amp in-line fuse was added as a mid-year change at Eldorado 8605524, and Seville #803986. Figure 2 details both the early and late style wiring.

If the BCM codes B441 and/or B449 are found to be caused by an open corroded fuse, the following procedure should be followed:

1. Clean the fuse holder terminals and cap. 2. Replace the 10 amp fuse.

3. Install the fuse holder cap to the front retaining bolt of the windshield washer solvent reservoir.

4. Install the fuse holder into the cap. Reference Figure 3 for view of the completed relocation.

5. Retest for proper cooling fan operation. If fuse is open after test, diagnose code B441, using Section 8D2 of the 1986 Service Information Manual.

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.