Thats is two different problems. the blower motor resistor is bad causing it not to work on the lower setting just high. now on the defrost not working could be the blend door actuator but to figure it out you will need to be diagnosed by a professional. it is a little more involved. but the blower resistor is fairly easy
let me know if you have any ore question
Testimonial: "The blower motor resistor as the cause for the fan only working on one speed was exactly correct. Bought a new sensor, installed and problem was fixed"
Follow the wires from the fan switch down to the heator box you will see whear the plug in to the side remove the plug then two small screws and lift out the resistor that sounds like your proublem
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