A/C - Inoperative Blower Motor/Poor Engine Performance

Bulletin No. T 86-61
File in Group 6E
Number 30
Corp. Ref No. 616504
Date June '86
SUBJECT: POOR PERFORMANCE DURING ENGINE WARM UP AND POSSIBLE LOSS OF ECC BLOWER MOTOR OPERATION

MODELS AFFECTED: 1986 ELDORADO AND SEVILLE

An inoperative Electronic Climate Control (ECC) Blower Motor and/or poor engine performance during warm up can be caused by an open Early Fuel Evaporation (EFE) circuit Fusible Link.

FIGURE 1 - WIRING HARNESS:

Connector C118 attaches the EFE Grid to the vehicle wiring harness (refer to Figure 1). Wire orientation in the vehicle harness side of this two wire connector, if reversed during assembly, could allow a short to ground in the EFE Grid. If shorted, the Fusible Link in the EFE circuit will open to prevent damage.

FIGURE 2 - FUSIBLE LINK POSITIONS:

Either Fusible Link "F" or "L" could open (refer to Figure 2). Both Fusible Links attach to red wires that lead to the Underhood Relay Center. Because both wires are the same size and color, they are used interchangeably for the EFE Relay and the Engine Cooling Fan Relay. Fusible Link "F" always powers the ECC Power Module as well as either the Cooling Fan Relay or the EFE Relay. Fusible Link "L" can also power either relay but DOES NOT power any other circuit. Both Fusible Links are located at the Power Junction Block under the hood on the LEFT (drivers side) inner fender.
If an EFE short occurs when Fusible Link "F" powers the EFE circuits, the ECC Blower Motor will also stop working.

If an EFE short occurs when Fusible Link "L" powers the EFE circuits, the ECC Blower Motor will not be effected.
Starting at Eldorado VIN broadcast number 607540 and Seville 805434 a jumper wire harness is used in connector C118 to correctly route the BLACK harness wire to the BLACK EFE Grid wire, and the BLACK/PINK harness wire to the BLACK/PINK EFE Grid wire. Refer to the following Service Procedure when repairing EFE circuits on vehicles produced before these break points.

SERVICE PROCEDURE

1. Install jumper harness P/N 12060696 into connector C118.

2. Replace the effected Fusible Link per Section 8A of the 1986 Eldorado and Seville Service Information Manual.