Power light on A/C Control flashing.

The car has plenty of freon, but why are some the lights on the cluster come and go. I notice a week a go the left temp adjustment the light was out. But the A/C worked fine. The wife drove here 2003 suburban home and A/C quit working. I checked it out, no fuse blown, againg the charge was good. Then I notice the light on the on and off a/c switch was flashing 3 or 4 times. What does this mean.