A/C Compressor - Engaged During Start-Up

91olds03

NUMBER: 91-T-65

CORP.REF.NO: 006505

DATE: February 1991

SECTION: 6E3


SUBJECT: A/C COMPRESSOR OPERATION DURING START-UP NEW CALIBRATION


MODELS/YEARS: 1991 NINETY-EIGHT


From start of production to VIN M4301400 1991 Ninety-Eight models equipped with the 3800 T.P.I. (VIN L) engine allow the A/C compressor to engage up to five seconds during each ignition switch cycle whether the A/C mode switch is in the "ON" or "OFF" position. This is done to minimize engine RPM flare. A/C compressor engagement during start-up on vehicles that have a sudden loss of refrigerant or have lost all the refrigerant over a period of time may contribute to an A/C compressor failure.

If a technician is servicing the A/C system on a vehicle built prior to the breakpoint listed, it is recommended that a new calibration mem-cal be installed, in conjunction with the A/C system repairs.

The new calibration will eliminate A/C compressor operation during engine start-up.

IMPORTANT: The new calibration mem-cals are currently being used in production. Verify if this mem-cal is already installed by the scanner I.D.

The mem-cals are currently available through GMSPO under the following part numbers.

SCANNER
ID IF
APPLI- AXLE MEM-CAL BROAD- SERVICE
YEAR MODEL CATION RATIO INSTALLED CAST PART #

1991 98 Fed. F17/2.84 9994 AXDH 16160178
1991 98 Calif. F17/2.84 0004 AXDJ 16160173
1991 98 Fed. opt. 3.06* 0014 AXDK 16160168
1991 98 Calif. opt. 3.06* 0024 AXDL 16160163
1991 98 Exp. opt. 3.06* 0034 AXDM 16160158

* Part of Option FE3 Touring Car Ride and Handling or V92 Towing packages.