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If the problem is a lack of air flow from the vents, and you suspect the blower motor is not running at times, you would need to test the blower relay and blower motor for power and ground when it is not working.
Have you topped off and bled the air out of the cooling system? Start there. You need a new thermostat and its possible the water pump is failing as well. Your cooling system may need to be flushed. Its also possible that your radiator needs to be replaced. Whatever you do, be sure that you don't drive the van until you've figured out what's going on and have repaired it. These engines are prone to head and head gasket problems (which may also be your issue) but if you catch it early enough and don't overheat severely, you can avoid that too. If you give me some more history I can try to help narrow the problem and come up with a plan of attack. Please let me know how you make out! Thanks and good luck!
Could be a leak in one of your AC hoses, or the compressor isn't kicking on. You can usually tell if the compressor comes on visually, so that is an easy one to check. If you have the gauges you can check the pressure of the AC system to make sure that it hasn't leaked out.
You may have air trapped in the lines to or from the heater core.
If you (still) have a real radiator cap on the radiator, remove it with a cold engine, start and run the engine allowing it to warm up while watching the water/coolant level.
Make sure the heater control is set to its highest heat setting while doing this.
If it is trapped air, you may see it 'belch' after the engine is warm and the engine thermostat is open.
Refill as needed if this is the case.
It's more difficult without direct radiator access and may require several cycles of hot/cold to allow refilling through the overflow.