If the water is not flowing through the radiator then it could be caused by a couple of things. The first and most common would be the thermostat is not opening. The thermostat opens and lets the water circulate. I believe that on these vans you can follow the top radiator hose to the engine and there will be a cover that is held on with 2 or 3 bolts. Remove this cover and replace the thermostat with a thermostat from the dealer. This is about the only part that I buy from the dealer. But the ones at the parts stores are not near as good. You have to replace them about every year. If it is not the thermostat then it is more than likely the water pump has gone bad. The water pump is what circulates the water through the radiator.
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