When you say "air doesn't blow at all," do you mean you can't hear the blower working? Or the blower does work, its just not coming out the vents?
I ask because the cruise control and vent controls (HVAC modes) are vacuum actuated. If your fan blows but the air only comes out your defrost, then it is likely a faulty vacuum line or lines for both. I'd check all the vac lines to and from the vacuum ball, to start with.
If the fan itself doesn't blow, then you need to check for power and ground at the blower motor connector. Of there is power and ground, then you would need a new blower motor.
Based on your answers to my questions, we can figure out if you have one common problem or 2 different problems.