what would cause my ac fan to blow on high only

2006 FORD EXPEDITION
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JCAB
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I have checked fuses all ok changed datc relay told it was bad but to no avail still the same issue
Jun 13, 2012 at 6:59 PM
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DOCFIXIT
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Faulty blower motor resistor
Jun 13, 2012 at 7:03 PM