1999 Other Chevrolet Models A/C Fan

I have had experience where the switch its self has bad internal connections. The A/C is probably working fine the swich only sends juice to the fan at the max position. To test if this is the problem start by seeing if you can get at the back side of the switch. Test the voltage comming through the switch at the different positions. If this is the problem you will have close to 12 volts at the max position and 0 volts anywhere else.