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Check coolant level. Start cold with cap off and add coolant as necessary with HEATER ON, while running. Let it get up to operating temperature and rad fan comes on 2 or 3 times, then make sure topped up and put cap back on.
Most likly this van has seperate controls for driver and passenger heat and ac controls.If its blowing hot air your heat is working.These controls operate differant dampers that are electonicly controlled.If the dials arent working they would cause this problem.
Most modern vehicles using an electric cooling fan have a thermostatic switch that will allow them to run even after the engine is turned off.
Start and stop driving can cause heat buildup in the block which can cause problems such as the one you have and if the fan isn't bringing the excessive heat down during a stop, the hot engine can refuse to idle or accept fuel as it should.
You should listen to see if the fan is turning on after the ignition is off; this is sometimes delayed for a minute or so until the thermostatic switch adjusts to the rising block temperature and starts the fan.
If the main fan is belt-driven, it may be the AC fan that is used for this purpose.