Wrknrvr Posted May 17, 2015 Report Share Posted May 17, 2015 To start with we have had this Volvo with a red top Cummins for over eight years. the fan always came on when the temperature was about 226 degrees. So I would pull over and let it cool down when doing a big climb on a mountain. Well we where going over a 9000 foot pass and the engine was warm. The DW was in the passenger seat and there was anther HDT behind us with more vehicles in the wagon train going up this pass. No passing lane and it decided to cut the rpms to 1500. The DW noticed it would sputter if trying to pass 1500 rpm. finally found a pull off. Let it cool down and continue at below 1500 rpm. The other HDT never crossed real mountain passes before so there was some things discussed about his . Then snow started to fall which bugged me as now I could not see the scenery. Then there was the DW in the other HDT. Skip those comments The next morning the truck would not build air but 10 lbs. pressure. So I installed a new air governor. It now operates at a few pounds pressure higher at cut in and where it shuts off. Now the fan comes on at a much cooler temperature as we did take highway 2 over the Butte Mt mountain instead of interstate 90. Very nice two lane road and is a truck route. Never did see another truck but the yellow HDT following us. Safe Travels, Vern Link to comment Share on other sites More sharing options...
PSD_Tweaker Posted May 18, 2015 Report Share Posted May 18, 2015 Vern, I'm not sure that the de-rating wasn't part of the near over-heat condition & altitude you experienced. Now I do not have a N-14, so things could be different than on my little D-12, but my fan will engage at between 195* & 200*. I'm quite fine with that temp. Rick 1998 VOLVO 610 VED-12 @ 425 HP with 13 speed, 22.5" rubber, TC Equipped, single 3.70 drive axle, 193'' WB. REESE, 30K 4 way rocker-hitch, Jordan Ultima 2020. Under-frame mounted Honda 3000 ei, Towing a DRV MobileSuites- 36TK3 with TrailAir Pin Box, a Yamaha Road Star 1700 on deck. http://diesel-gypsy.blogspot.com Link to comment Share on other sites More sharing options...
SunJuniper Posted May 22, 2015 Report Share Posted May 22, 2015 thats one of the reasons i have the Fan override switch installed in mine. can turn on the fan when i want it to avoid getting that warm before the fan turns itself on. bigger issue is why the fan is only turning on when its that warm... think i would also be looking at replacing the fan solenoid. i gave the part number of the override switch to sibernut (aka Ron) and he has one in his truck... believe his is a a cummins (mines a Detroit) Fulltimer Class of 2007 1998 Volvo VNL64T610 Detroit Series 60 12.7 470HP/1650TQ Eaton 18spd 228"WB Tandem2006 40' ToyHauler 3 slides and a 14' Toybox Link to comment Share on other sites More sharing options...
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