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What would cause a 1998 Dodge Ram Van 1500 to overheat on the highway only and cool down when going slower?
Wiki User
∙ 12y ago
could be a bad radiator, or not enough flow to radiator
AddendumI had the exact same problem and it turned out to be a plugged up radiator.I also had this problem, so hose flushed the radiator, and the problem still persisted. Turned out that the thermostat was sticking; not opening fully. I put another one in, and it's running cool now. Change your thermostat. They need to be changed anyway, so do it, and I'll bet your overheating problem will be cured. Cheapest cure there is.
I recently went thru this on a 99 Dodge ram 1500, replaced the thermostat, still had probs with over heating on the highway, after that noticed that my water level in my radiator kept going down, changed the water pump and that was the issue. after about a week of overheating and running low on water. if replacing the thermostat doesnt work, you need to check to see if you have any water leaks at all on your water pump, then with as old as my van is, i just make sure once a week to check my water level and keep water in my resivoir as well, never had a prob since.
Wiki User
∙ 12y ago
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