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Turned out to be vapor locked. Had replaced a bad water pump. The heater coil is above the radiator which caused a vapor lock. The van had no front heater either, only cold air. To fix the problem, the van has to be parked with the front end on an extreme upslope or jacked up high so that the radiator is almost even with the dash. Then run the vehicle with the heater on high WITHOUT the radiator cap on. It may take some time but your air bubble should come out. Be careful, it will boil out a bit and is hot. My van held another 5 gallons of water afterward and runs cooler now!

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โˆ™ 2006-03-03 13:16:21
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Q: What would cause a 1998 Dodge Ram Van 1500 3.9 liter to overheat on the highway but cool down in town or at slower speeds?
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