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Its more than likely a poor connection at the blower motor resistor.Its mounted on the heat duct on the passenger side with 2 screws.I would first turn the ignition and fan switches on with the fan switch on #2 or 3 then wiggle the connector on the blower motor resistor.These resistors get hot and melt the pigtail and usally loose there connection.
lower settings as far as speeds for your blower motor go through a resister block to reduce the voltage your blower motor receives to make it turn slower. If it turns slow on high you would have to check the voltage at the blower motor, should be the same voltage that would be at the battery. There could also be material in the blower motor fan like things a mouse could have put there. Causes the fan to spin slower and also blocks the fins from pushing air. Any strange noises would be heard unless you have had the prob since you owned it and could not detect any changes. It could be even full of stuff and still be in balance. but it could be a few other things.