Originally Posted by mbaessler
Cooling: Well this is a disappointed. My comparison is to my 99 Expedition. It could be 100deg going up a hill with AC on pulling same weight and my coolant needle never moved. It was working. I do not know how sensitive that gauge was to change. Now the Jeep. Lets describe the temperature gauge in 4ths. The first 4th when it's cold. 2nd 4th is normal running range, 3rd 4th and 4th 4th is, oh no too hot. When towing driving on flat road with no head wind it was always in the 2nd 4th, which is normal. If I had any head wind or even a small grade it went to 3/4's. But recovered quickly to 2/4's going back down a hill or back to flat or the head wind stopped. Don't know if our Jeep gauges are more accurate and sensitive. Seems like cooling system is undersized! I was towing a small load I expected not to see much extra heating.
I don't tow so I haven't paid too close attention, but the consensus is the Jeep temp gauge is linear and honest. If you're not in the red zone, you're not in trouble. Your Ford's temp went up too, but the needle was "dumbed down" so it didn't move. It's not just Ford, it's almost everyone. Those gauges are almost no better than an idiot light. And you can see why they've done that. People get nervous when the gauge moves too much.
The Ecodiesel runs warmer than many engines, that's true...the thermostat doesn't even open all the way until the coolant temps get to 225 deg F (107 C), starts to open at 207 F (97 C). But I don't know of ANYONE who has overheated towing with the Ecodiesel. Especially when it first came out, there were a lot of posts like yours though with owners thinking they were running too hot because of the "honesty" of the temp gauge.