Check fuses, there may be more than one fuse that controls the blower motor. If fuse is OK, then check relays (somewhere in a box). If relays and fuses are OK, then check (some dashboard dissassembly required) if voltage is getting to the blower motor. If there is voltage present, then suspect burnde blower motor, or if motor works only at full speed, then suspect a burned resistor in the blower motor assembly.
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