Oh man, are you in trouble! Nah, just kidding. Yes, it looks like the servo motor for the airmix door has lost it's mind, so it's cycling between heat from the heater core and cool air from the evaporator. Whether the van appears to have manual controls (CE / LE) or automatic (XLE), the whole system is electronic - there are no cables or hard connections between the dash and the HVAC hardware. A servo motor is supposed to track the setting on the dash, but they can go bonkers. Most likely it's the actuator/sensor in the motor assembly. In an extreme case it could be the AC Amplifier and ckt board in the dash. In most cases, simply swapping out the motor assembly (removing the 3-4 retaining screws and carefully disengaging the cam rod) is all it will take.
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