ECC A/C System - Insufficient Interior Temperature

91cadillac04

Bulletin No.: T-91-87
File in Group: 1
Number: 76
Corp. Ref. No.: 918114R
Date: May, 1991


SUBJECT:
ECC SYSTEM CONTROLS TOO COLD (HEATER MODE)

MODELS AFFECTED:
1989-1991 ELDORADOS AND SEVILLES


This bulletin supersedes Service bulletin T-90-17 which should be discarded. This bulletin is being revised to add the 1990 and 1991 model years and update part numbers.

Some 1989-1991 Eldorados and Sevilles may experience a condition of insufficient interior temperature after vehicle is driven for a sustained period.

To repair this condition use the following procedure:

1. Perform ECC system check outlined in Section 1C of the Service Information Manual.

2. If system check indicates no problem, check BCM PROM I.D. (diagnostic parameter BD99) with the chart below. If vehicle PROM I.D. corresponds with original PROM I.D. listed, replace with new PROM I.D. as indicated in the chart.

PROM CHART


ORIGINAL PROM I.D. NEW PROM I.D.


Broadcast PROM Broadcast
Code I.D. Code I.D. P/N

1989 ANDP 3776 AUKN 1046 16151037
APYK 3426
ASAP 8766

1990 ANXX 9236 AUKP 1056 16151314

1991 AUUY 5996 AYDR 4606 16164604
AWNF 6416


Parts are currently available from GMSPO.

For warranty purposes use Labor Operation N4801 at .5 hour.