Toronado V6-231 3.8L (1986)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
A/C - Improper Temperature Control
SUBJECT:
IMPROPER TEMPERATURE CONTROL IN DRIVER SELECTED LOWER OR UPPER MODE AIR DELIVERY
(REPLACE PROM)
MODELS/YEARS:
1986-88 TORONADO
NUMBER:
88-T-144
CORP. REF. NO: 911203
DATE:
June 1989
SECTION:
1C, 8D
Some 1986-1988 Toronados may exhibit a condition where the discharge air temperature does not control properly when the forced upper mode or
forced lower mode settings on the control panel are selected. Should this condition occur the symptoms are:
^
Discharge air from the A/C outlets becomes too warm when the forced upper mode is selected.
^
Discharge air from the heater outlet becomes too cold when the forced lower mode is selected.
This condition may be due to the calibration value for the forced upper and lower modes within the BCM PROM. To repair this condition enter
diagnostics as outlined in Section 8D of the Service Information Manual to check the BCM PROM I.D. and replace, if necessary, with the new part
number from the table below:
Old
New
PROM
PROM
Model
I.D.
New P/N
I.D.
1986 Toronado
6763
16124160
4163
1987 Toronado
5453
16124161
4173
1988 Toronado
173
16121073
1053
(before VIN JU309680)
Parts are currently available from GMSPO.
Warranty Information to Replace PROM:
Labor Operation Number:
N4801
Labor Time:
.5 hrs.
