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bad blower,buy a good one and replace
replace the blower motor switch
Same problem on mine...I had the blower motor module replaced and it works great.
If the blower only works on high the blower resistor is most likely the problem and should be replaced. On rare occasions if the car has blown the resistor more than once the blower motor shouuld be replaced.
blower resistor
The blower motor works on only one speed. The blower motor resitor pack is defective and needs to be replaced. It is located on the blower housing in the engine compartment just below the blower motor.
i just replaced the thermostat in 2004 Chevy truck heater works fine now
Normally when a heater blower motor only works on the High setting, it is caused by a defective Blower Motor Resistor Pack. The fix is to, Replace it. In very rare instances it can also be a defective blower motor speed control switch, but rarely.
It is likely the duct work how ever it can be the fan has come off the fan motor
Defective blower motor resistor pack.
Figured it out...the blend door actuator was not fully seated when I replaced it.
the resistor for the blower motor is busted blower works on high with out it