Heater & A/C Controls - Lock Up or Operate in Reverse

9232oldsmobile04

NUMBER: 91-T-239

CORP.REF.NO: 231202

DATE: June 1992

SECTION: 1C


SUBJECT:
HEATER-A/C CONTROL ASM. MAY LOCK UP OR OPERATE IN REVERSE
- REPLACE HEATER-A/C CONTROL ASSEMBLY

MODELS/YEARS:
1989-91 CUTLASS SUPREME
EQUIPPED WITH AUTOMATIC ELECTRONIC AIR CONDITIONING (C68)


CONDITION:
The Heater-Air Conditioning Control Assembly on the 1989-91 Cutlass Supreme equipped with C68 may lock up (not respond to any inputs), or may cause the temperature door to go to full hot when full cold is requested. This condition may occur when the temperature door actuator is replaced.

CAUSE:
Software conditions in the control assembly. These conditions were corrected for the 1992 model year.

CORRECTION:
Replace the Heater-Air Conditioning Control Assembly with the 1992 part number. These numbers are:

16171487 Without Rear Defrost
16171488 With Rear Defrost

Parts are currently available from GMSPO.

To temporarily correct this condition while the part is being ordered, perform the following steps:

1. With ignition off, remove the 15 amp "ELEC" fuse (fuse # 2).

2. Start engine.

3. With engine on, reinstall the fuse.

WARRANTY INFORMATION:

To replace the Heater-Air Conditioning Control Assembly, use existing labor operation. Add 0.2 hours straight time, if necessary, to perform the temporary repair listed above.