Your van apparently has dual heat and air and it sounds as if your rear unit is working and your front is not. Will the front blow at any speed? or is it completely dead? If it will only operate on a medium setting you should have your blower resistor changed out, but if it does not operate at all, check for voltage at the blower motor plug in. If you have power but the motor is not running then have the blower motor changed.
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Your van apparently has dual heat and air and it sounds as if your rear unit is working and your front is not. Will the front blow at any speed? or is it completely dead? If it will only operate on a medium setting you should have your blower resistor changed out, but if it does not operate at all, check for voltage at the blower motor plug in. If you have power but the motor is not running then have the blower motor changed.