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Could be,Blown fuse,Bad blower motor,Bad blower motor switch,Bad blower motor speed resistor,
If it's a fan speed issue check the blower motor resistor & the blower motor. Check the plugs at the resistor and blower motor for burn marks also.
Common causes, blower motor resistor, blower motor, wiring or controls
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Sounds like the wire that goes to the blower that is behind the glove box which you would have to remove then pull the wire off and push back on, that's usually the problem.
2001 buick lesabr // when recirculate speed doesnt change only make humming sound rest of heater works fine
Some jet skis have a learning mode which wont allow you to go full speed and full rpm's, use that.
Blower motor bad. Blower resistor bad. Switch bad. Fuse blown.
It may be the resistor pack along the firewall under the fuse cover somewhere. This controls the speed of the fan.
Same problem on mine...I had the blower motor module replaced and it works great.
Should under dash on firwall near blower motor.
Classic symptoms of a burned out blower motor speed resistor. Examine the wire harness and all connections for damage. The year, make and model info would help for more detailed info.