You don't list the vehicle your asking about but in general when the blower motor only works on the high speed the blower resistors have blown. The resistors are what control the fan speed, when they go bad only high will work. The resistors blowing is usually a side effect of a blower motor going bad, pulling too much current. When replacing the resistors it's advisable to replace the blower motor as well so as not to have a repeat problem.
Posted on Aug 19, 2010
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Posted on Jan 02, 2017
SOURCE: my 2002 jeep liberty 3.7L the heater stop blowing
this sounds like the heater motor resistor has gone bad and needs replacing.this controls the amount of voltage that goes to the blower motor to give you the different speeds.if it was the blower motor it wouldn`t have worked on #4 setting before stopping.this us located in the air box as it uses the air flow from the motor to help keep it from getting too hot,usually in the area of the motor and has about 5wires connected to it.
Posted on Oct 19, 2011
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