Seville V8-273 4.5L (1989)
Body Control Module: Customer Interest
ECC A/C System - Insufficient Interior Temperature
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.