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Have you check the level of Anti-freeze in your rad? Or had work done on the van that would require the removal of the anti freeze?
You may have a air bubble trap in you heater core. Fill up rad to about a 1 inch below the top, then run engine with rad cap off for 5 minutes while the engine circulates the anti-freeze this will allow the system to burp. Best not to do this on your driveway, because sometimes when it burps it spits out anti freeze.
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