Program Number
WARNING: This page is about a different car, the 1998 Cadillac Eldorado and 1998 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
The program number is calculated by the ACM to determine the amount of heating or cooling required to meet the desired in-vehicle temperature. This number is based on set temperature, outside temperature, in-vehicle temperature, and sunload sensor.
The program number determines the proper air delivery mode and blower speed, and is also a factor in determining air-mix valve position. A program number of zero indicates maximum system cooling, and a program number of 255 represents maximum heating. Program number can be observed using scan tool.