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If the air blows out of all of your other vents then you have either had an actuator go bad which controls which ducts the air flows through, or the shaft that has the "flap" on it has popped loose and no longer moves which will only allow air to go to the vents that are not locked. The easiest way to find out would be to get under the dash and start at the fan and trace air flow til you find the problem.
Usally when a blower motor resistor goes bad the fan still runs on high. The resistor lowers the voltage going to the fan to make it run slower. The high setting usually goes straight thru. Resistors are usually easy to get to, under good on the firewall or under dash passenger side. Cost about $24 at parts store. Replace with new if that doesn't work return it.
Tenia, the most likely cause is that you are low on engine coolant. The coolant from the engine also runs through your heater coil. Check the coolant level when the engine is cool. There is a line in the coolant resevoir that says 'Cold Max'. Add the premixed coolant until you reach that line.
If that works, I would monitor the coolant level over the next few days. If it drops again, you likely have a coolant leak somewhere.