Temp panel lights off, when they come on radio goes out

The lights on the panel for the heat/ac are off when the car turns on. Noticed this started about 2 days ago. Occasionally, when they lights turn on they have turned off the radio. On a few occasions, if i tapped the panel the light have come on... is it a fuse or a loose connection

Replace the bulb. It's very small behind the fan switch knob. Pull off the knob and pull the bulb straight out to replace.