Why does the 94 gmc suburban ac not work on low speed?

The issue with a 1994 GMC Suburban's AC not working on low speed is often due to a malfunctioning blower motor resistor. This component regulates the fan speed, and if it fails, the blower may only operate on high speed or not at all. Other potential causes could include a faulty blower motor or issues with the vehicle's electrical system, such as a blown fuse. Checking these components can help identify and resolve the problem.