Pressure switch stuck open. I removed the hose from the blower housing and with very little effort the switch closes. If I remove the hose from the pressure switch, I cannot suck or bow anything through the hose. I used a small allen wrench and stuck it in the opening of the fitting on the blower housing and it doesn't go down very far. It doesn't seem to be stuck. Should I be able to pass air through the hose?

Yes air shold go into the motor when blowing threw it. And should have suction when the motor is running.