Well, where to start...what you are calling an air solenoid is probably the intake manifold heater, the switch that controls it is to the left of the 3 lever switch on the dash. It sounds like you might need to get a bit more familliar with the truck, go here,
http://www.steelsoldiers.com/deuce-tms/77607-tms-deuce.html
Start with the -10, that's the operators manual, read that, cover to cover. Remember, this truck isn't your average Toyota, it is a rolling 13,000 lb weapon that can hurt/kill you or others. Please take the time to learn your truck and learn to operate it safely. And, if you have any questions, please feel free to ask away.