When the temp dial is turned to maximum cold, the vents blow cabin temperature air (instead of the cold temp I expected). The temperature is the same whether or not the A/C button is pressed, but the blue light appears while the A/C is on. The temp remains the same for any number of minutes. If I turn the dial to hot, hot air blows out as expected.
did you check the fuse? Is the compressor turning? Does engine sound, rpm change when you hit the button?