A/C Control Assembly - Celsius/Fahrenheit Display

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NUMBER: 90-T-158

CORP.REF.NO: 008115

DATE: August 1990

SECTION: 1C, 8A


SUBJECT:
SERVICE MANUAL UPDATE - SECTION 8A AND ESM - (OPERATION OF CELSIUS/FAHRENHEIT)

MODELS/YEARS:
1989-1990 EIGHTY-EIGHT AND NINETY-EIGHT


The following information is to be added to the 1989-90 Eighty-Eight and Ninety-Eight Service Manuals.

The Heater and A/C Control Assembly on vehicles equipped with Electronic Air Conditioning (C68) can be programmed to display the external and programmed temperature in degrees Celsius, instead of degrees Fahrenheit, when the ignition switch is turned to RUN. Vehicles being operated primarily in the United States should be programmed to display degrees Fahrenheit, while Canadian and exporl vehicles should display degrees Celsius.

To have the temperature displayed in degrees Celsius upon power-up, a wire connects terminal 11 of the Heater and A/C Control Assembly to ground. This wire should not be present in vehicles operated primarily in the United States.

If a vehicle is received that displays temperature in degrees Celsius when the ignition switch is turned to RUN, the Heater and A/C Control Assembly can be reprogrammed to display degrees Fahrenheit by removing or cutting the wire that connects terminal 11 to ground.

Be sure to tape the cut ends back to prevent shorts.