[Flick]

[color=rgba(0, 0, 0, 0.701961)]     Driving on I90 West from Spearfish, SD to Billings, MT. Towing 2006 Jeep Wrangler Unlimited. Within 10 minutes of starting out the coach began to climb in temperature above the 190 red mark to almost 210 (see attached). The engine oil did also heat up over the red mark for a few minutes then settled down.  I don't know who marked this gauge this way. Now the grades were not steep but were gentle hills. We hit a couple 6 percent but that was later in the day.  We were averaging about a 62 MPH and running about 1,600 RPM.  I got worried the heat would damage the engine so we pulled over and disconnected the Jeep. Drove another 60 miles and the engine cooled down to about 185 on the gauge. I also had installed a digi panel gauge to more closely monitor temps. The digi is consistently 15 degrees cooler than the gauge. It also measures transmission temp. The regular gauge showed that at 210 - 220 while digi said a steady 175.[/color]



[color=rgba(0, 0, 0, 0.701961)]So first question is can these old gauges go bad? Trying to decide which one I should trust more. [/color]



[color=rgba(0, 0, 0, 0.701961)]Next question is what temp should I try not to exceed on the engine or is there a point where you say if you exceed this temp for X time stop and let the engine cool. When I stopped the engine it cooled right down and went over 190 on the old gauge again just a couple of times on big hills after we unhitched the jeep and drove it. I kicked the speed up as well to 65 with 1,800 RPM. Grade of road was the same and maybe even hillier. I will hook the Jeep up again tomorrow and try again. I don't think I missed anything in that. We have towed it before as well as a car trailer with no issues. The temp may spike on a hill but settles down again. Oh and I am topped off on radiator fluid so that's not an issue. [/color]



[color=rgba(0, 0, 0, 0.701961)]Lastly on dead flat roads at 65mph with not much wind the turbo never went below 5-7 PSI. going over simple bridge overpasses it would go to 15 psi. I have never watched this before. I think I have power but wonder if I should change fuel filters just the same. If she is beginning to clog in the filters will that make the turbo run more and thus get hot?[/color]