This is an indication of the blower motor resistor is bad and needs replacing. the resistor circuit for those speeds are bad.
SOURCE: 2000 cherokee sport blower motor control
It is a bad blower motor resistor and it is mounted on the bottom of the A/C heater housing on the passenger side of the vehicle under the glovebox area. Hope this helps. Please rate this a fixya if it helps. Thanks.
Mike
SOURCE: 02 GMC Sierra-heater-a/c motor only works on high speed
Check or have checked the blower motor resistor. These resistors will cause this problem. I would go this route first as these are relatively inexpensive and usually the problem.
SOURCE: 2003 GMC Sierra heater Blower wont shut off
My 2003 Sierra's blower came on by itself in the garage while I was sleeping and ran the battery completely down. I had to replace the blower switch located under the glove box next to the blower at the bottom of the right corner of the dash. The switch is in front of the blower and held in by two screws. Disconnect the two wire connections. This is a "dealer only" part and cost me 65.00. Also check the wire harness with seven wires connected to it for melted plastic. It will be marked "ABCDEFG". If it has melted, you'll need to replace it. Pay attention when reinstalling either part, that the wires "ABCDEFG" match the switch in that order.
SOURCE: 2004 Ford F150 - AC/Heater blower speed 1 & 2 not working.
You might have a bad speed selector switch, or your blower motor resistor is faulty.
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