i have a 1996 dodge ram 3.9LT 4x2 1500 and driving it for 20 Min's it started going over 95' slowly gettin hotter. and my engine started steaming. i checked my coolent and it was empty so i filled it up drove for another 20 mins it got even hotter pretty close to 125' and then it slowly went down but it is still not normal temperature and it is stuck in the middle between 95' and 125. what could it be?