A/C - Insufficient Cooling During Light Acceleration
89Chevy19Number: 89-115-1B
Section: 1B
Date: MARCH, 1989
Subject: INSUFFICIENT A/C COOLING DURING LIGHT THROTTLE ACCELERATION
Model and Year: 1988-89 B-CARS WITH 5.0L (VIN CODE Y) ENGINE AND A/C
TO: ALL CHEVROLET DEALERS
A condition of insufficient A/C cooling during light throttle (5% TPS) acceleration may be the result of the A/C compressor being disengaged momentarily as the throttle is being depressed. This is the result of the PROM calibration.
Should comments be received of this condition and the A/C refrigerant system is functioning properly, you may need to install a new service PROM listed below.
There was a running change made in the 1989 model year to eliminate this feature. Use scan tool to verify PROM I.D. before ordering parts.
Scan Tool Broadcast
Model Emissions New Service PROM PROM I.D. Code
B Federal 16122177 5833 ALUP
B Calif 16132056 2053 APSW
NOTICE: 1988 California models only: This prom may allow a code 53 to set when installed. Some scan tools may not display this code. It may be necessary to enter 1989 for year in the scan tool or ground the ALDL to display this code. Use the 1989 service manual for diagnosis.
Warranty Information:
Labor Operation: T0500
Labor Time: .4 hrs
Trouble Code: 92