I think it is blower motor resistor issue. If it is then try this to change it:
http://www.ehow.com/how_4760922_change-blower-motor-resistor.html
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SOURCE: Blower on the heater/AC not working on 1998 Escort, checked fuse under dash?
Ok, first off, check the fuses under the dash. If they're all good, does the blower work only on high speed? If yes, then you have a bad blower motor resistor, which is located under the hood, near the blower motor itself. If the motor doesnt work at all at any fan speed, make sure the wiring harness that plugs into the motor under the hood is clean and tightly installed. If it still doesnt operate, sometimes tapping on the blower motor housing will kick it on, but if that doesnt work, you may have to replace the blower motor. They are available aftermarket, and arent usually too expensive.
SOURCE: Blower for AC/Heater stopped working
hi
my heater blower has stopped working all together i have checked all the fuses but do not no where the relays are for the heater.
SOURCE: 2000 ford explorer fan blower only works intermittently
On ford vehicles the blower motor resistors are the most common problem when this happens.
SOURCE: No air blowing 1998 Ford E350
blower motor location is in the heater box down by the passengers feet the fan relay in out under the hood in the power fuse box check this first
check to see if the blower motor turns you can do this by removing the three screws the motor and squiral cage will come out spin it if it moves freely putit back replace the switch assembly
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