Vent control problems?

Does it do the same thing if you select the defrost or dash vents while in heater mode? Do you hear any hissing from the control panel area while in A/C mode?

Ok, Open the hood and look for a vacuum line that runs back to the dash. Follow that line and see if it is split/cracked or disconnected. That line feeds the control panel. It goes to a T in the line that connects to the vacuum reservoir. That reservoir has a check valve in it that may have failed. Follow the other line off the reservoir back to the engine, it will connect to a port on the intake manifold. That is the same line that actuates the 4X4 as well. So check that mess of vacuum lines for a leak as well.