Blower motor resistor is bad. It is a little circuit board with resistors on it that changes voltage to the blower motor. When it goes bad, you get full speed only.
either the blower control switch or the blower motoer needs replacing
Blower switch and connection had a melt down.
try replaceing the switch that controls the low to high for heater It's gonna be the blower motor resistor (near the blower motor).
2004 chevy cavalier is idling to high
faulty blower motor resistor
blower resistor is bad
What about it? Need more info.
Replace the high speed relay.
Probably your blower motor speed resister is burned out.
The blower motor resistor pack is defective. Replace it.
The blower resistor has probably failed. The connecter also likes to fail. They are located under the hood on the large black plastic housing on the passenger side. There are 4 wires in the connecter.
The blower motor speed resister is burned out. This part is available from your local auto parts store.