I replaced my blower motor on my 2003 pontiac aztek seems to be working great except now the air does not seem to come out any of the vents.i know the motor was bad cause i hooked up a new resistor to it and it still didnt work i didnt change anything else but the motor why is this happening?

SOURCE: where is blower motor resistor

There is a resistor pack for the fan speed in the ductwork near the fan.. It is very easy to replace once it is located. Ussually there are either one or two 5.5mm screws holding it in place. Once you get it out you will notice the resistors that are burnt.

SOURCE: 99 Olds Intrigue, blower fan resistor

It will burn out. Air flow in the heater box cools the resistor. These resistors get very hot when the blower is running.

SOURCE: BLOWER RESISTOR BAD FAN ONLY RUNS @ HIGH SPEED

Chevrolet 2004 TrailBlazer

Look next to the blower. You can remove the panel under the passenger side. Go through the glove box and move it down out of the way to access the electrical connector. Then remove two bolts and the electrical connector.

SOURCE: Blower motor vent selection switch not working

the hvac selector switch in the dash may be the problem.You need to remove the switch and look at the connector on the back of switch,see if there are any burnt wires at the connector or switch.It's all electronic and the switches have been known to burn out on this and other model.

SOURCE: 2003 Chevy AC Fan Blower Motor troubleshooting

first check the fuse or relay.. this will be the cheapest sollution and easiest to check.