Please help, How do you know if the motor blower is bad?
 

I have a 2004 town and country. The air works only in the rear, does anyone have an idea on how to know if it is the front motor blower, motor resistor or the switch? Thank you for any help!

When the resistor goes, the blower will operate only at full speed.

To check the switch, put an ohmmeter across the terminals.

To check the motor, put 12 volts across it.

Need a little more advice on my 2004 Town and Country
 

Thanks for the help on the motor blower, I ran 12 volts to it and it started working. I then changed the resistor and everything started working. I now have a new problem, I do not know if they are connected or coincidental, but there is a burning smell when the air is on. The smell comes and goes, any ideas on what this could be? Thank you for any help.