08Datsun wrote:It's normal for the temperatures to be a bit higher when towing. This has been true with every tow vehicle I've owned, although like you said, its had to tell what's going on when the temp gauge on the PF doesn't move.
There was a thread last year about cooling with some discussion about the temps and the two cooling fans. I can tell you that my electric fan clicked on high mode(it's a two speed fan) which indicates it was up to 221 degrees. It was idling at the time in 115+ degree weather with the AC on. I've never heard the mechanical fan engage. There are some other peoples experiences on that thread if I remember including someone towing a similarly big trailer to yours through Utah.
BTW, how do you like that tuner?
I guess the thing that has me worried is that about november last year i noticed i wasn't getting any rear heat. The reason was that I was about 1/2 gallon low on coolant. I haven't checked my truck since I towed this weekend, wondering if the elevated engine temp may be causing some coolant to evaporate. I did have Nissan do a pressure test on the cooling system a few months back , and they didn't find any issues.
What I don't want to have happen is find out I have a failure somewhere causing the temp to go up. Normally the temp is 180-185F. When towing it went from 185 - 208F. And it was only 40F, so no a/c or high ambient temps to combat. I guess there would be additional load from the trannie cooler though.
The Superchips Tuner is cool, I think it makes a difference, although its really hard to tell without a dyno. The XS Mileage save mode makes a very slight difference in overall fuel economy. I have switched it over to Performance mode all the time now.
I think a cooling system flush is in order. Will probably replace with Honda premix, as has been recommended on several posts here and elsewhere.
t