When I turn my a/c, heater on looks like it works because it lit the blue a/c light inside but doesnt throw any air through the vents. The a/c radiator fan also turns on. What this can be??

 

check to see if your getting voltage to your blower motor located under the dash on the passenger side if you are see if you have a good ground and if both of those are good then your blower motor is probably no good.