JMer806 :
Is it an input or output fan? If it's your only intake fan, then it could be a problem. Fans are easy and cheap to replace though, so why wouldn't you just replace it?
how do i know if its input or output?
Intake fans move air into the case, output fans blow air out of the case. Hold a Kleenex up to the fan and see if it pulls toward or away from the case. In your case, since the fan is broken, you'll have to work a little harder. Assuming that you haven't changed your fan configuration, you can look up the specs of your case online and see their airflow diagram, which should show you. Otherwise, you can take the case apart and look at the fan - most fans have an arrow on the side indicating the direction of airflow.