It is the heater fan resistor that is bad, it has different steps for the speed of the fan motor from low to high.
That woul be a bad blower motor resistor or a bad blower motor resistor connection.Turn on the ignition switch and put the fan switch on high then pull on and wiggle the connector going to the resistor.These resistors get hot and usally melt the connector causing it to loose its contact with the prongs.The resistor is located on the passenger side mounted on the heat duct with to screws.
Testimonial: "that was it! connector got hot, cleaned connector and works great, thanks"
SOURCE: blower motor on 1999 chevy express van works only
Just to add to the previous post. The blower motor resistor is under the hood on the passenger side behind the battery.
SOURCE: The fan/blower only works on the high setting.
the various speeds are controlled through resisters (spring-like in apperance) one of different value for each speed, none for highest speed as the power gets to the blower uninpeeded . the resistor pack could be located on the center of the firewall, held by 2 screws. thats under the hood. where the engine bay ends...i.m sorry i don't know the exact position on your model
SOURCE: Where is the Fan motor relay on a 1995 chevy astro
check the blower resistor near the blower motor,
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