Heater A/C Blower Motor - Inoperative

90amcjeep04 Models

1988 & 89 BC


Subject

Inoperative Heater A/C Blower Motor


Index


ELECTRICAL


Date

June 18, 1990

No.


08-55-90

P-1793 (C08-05-0)
BODY CODE LEGEND

BC - MEDALLION


SYMPTOM/CONDITION

Inoperative heater-a/c blower motor.

DIAGNOSIS

Inspect the heater-a/c 30 amp fuse holder and fuse block for signs of distortion. If the fuse block shows signs of distortion, the fuse holder should be repaired as shown below.

PARTS REQUIRED

1 Fuse block extension (1988 only) T1996073
4 Wire terminals (fuse holder) T1997040
2 20 amp fuses J3231217
1 Heat shrink tubing 04419644
2 3 inch pieces of red
14 gauge wire (procure locally)

Figure 1:

REPAIR PROCEDURE

The repair procedures consists of removing the original single 30 amp fuse (Figure 1), installing a fuse block extension and soldering in new wires which then divides the blower motor current load through the two new 20 amp fuses.

1. Disconnect the negative battery cable.

2. Remove the fuse block from its mount to gain access to the wiring on the back side of the fuse block.
3. From the back of the fuse block, cut the red battery positive (B+) wire as close to the fuse holder as possible. Next, cut the two 14 gauge red-withblue-tracer wires from the protected side of the fuse holder.

4. Inspect the fuse block for the presence of two extra empty fuse cavities. On 1988 models there may not be any empty cavities. If there are not two extra empty cavities, install the fuse block extension PN T1996073 by snapping it onto the top row of the existing fuse block. This will provide an additional row of extra fuse location.
NOTE: ALL CONNECTIONS MUST BE SOLDERED USING ROSIN CORE SOLDER. DO NOT USE ACID CORE SOLDER OR ANY CRIMP TYPE OR OTHER QUICK CONNECTORS. FAILURE TO SOLDER THESE CONNECTIONS MAY CAUSE HIGH RESISTANCE AND RESULT IN REDUCED BLOWER MOTOR PERFORMANCE.

FIGURE 2:

5. Strip the insulation and solder splice the two, three-inch sections of 14 gauge red wire to the red B+ wire previously cut from the fuse holder. Slide the piece of heat shrink tubing over the splice and by using a heat gun, shrink the tubing over the splice. Solder two PN T1997040 fuse holders on the other end of these three inch pieces of red wire (Figure 2).
Strip the insulation and solder PN T1997040 fuse holders to the end of the two red-with-blue-tracer wires previously removed from the protected side of the fuse holder (Figure 2).

6. Install the wires with the soldered-on fuse holders into the applicable fuse block or the fuse block extension. Make sure that the fuse holders are fully seated and locked in place to prevent them from pushing out when the fuses are installed.

7. Install the fuse block back into the car and install the two 20 amp fuses.

8. Connect the negative battery cable.

9. Check for proper operation of the heater-a/c blower motor.


POLICY: Reimbursable within the provisions of the warranty.


TIME ALLOWANCE
Labor Operation No. 08-90-05-90 0.9 Hrs.


FAILURE CODE: X6 - TERMINALS DAMAGED