The other day I was pulling a trailer with a transmission on it, later that day I was driving home from Meijer without the trailer and I noticed that my temperature was rising over 210 a considerable and concerning amount. Once I got onto a main road and could get some wind blowing through the temp dropped to 210 and stayed there till I had to slow down and accelerate again. When I got home I checked the dexcool and I couldn't see any in the reservoir in the engine bay, so I bought some dexcool and filled the reservoir, but it's still overheating when I'm not driving over 35 or so. Does anyone have an idea what's going on?