What does the yellow light on the A/C button mean?

"When the yellow light is on, the air conditioner delivers cold air when the interior of the car is hot and then gradually tempers the air as the interior of the car cools down. This is done by gradually changing the temperature set points at which the compressor cycles to higher temperatures."

"To see exactly how this all works check out the graph at the bottom of page 24-4 of the "Technical Information Manual"."