bluflame11 Posted September 6, 2017 Report Share Posted September 6, 2017 Hi friends! We have a 2007 730 with d12 and 2 pedal Eaton 10 speed. We purchased this in January. My family absolutely loves traveling in the truck! Everyone has been so helpful! We have been having some concerns with overheating while towing grades. While towing up hill, the temp gauge would climb upwards of 215+, then the "check" light would come on and the message center displayed "engine ecu maintenance required". We did not want to mess with overheating, so to the dealer it went. They supposedly checked everything out and said it was the temp sensor, and replaced it. Next time out, same issue. Called the dealer and they said everything checked ok and since no codes were being left on the computer, they did not know where else to go. Yesterday, climbing a grade, the same messages came on, but them it progressed to the red "stop" triangle and the message center said "engine coolant temp high". We backed way off, and thankfully crested the hill without shutting down.... obviously I am very concerned. Once we crested the hill, the temp cooled down and all lights/ messages went away... Any ideas? Link to comment Share on other sites More sharing options...
MrSeas Posted September 6, 2017 Report Share Posted September 6, 2017 A couple of things..... Is the engine fan engaging? RPM's you were running? Did you try down shifting to a lower gear? What is your normal coolant temp? Link to comment Share on other sites More sharing options...
GeorgiaHybrid Posted September 6, 2017 Report Share Posted September 6, 2017 Besides those, I would check the radiator flow and make sure it is not clogged with something and check on the thermostat. You could also have a problem with the water pump. 2017 Kenworth T6802015 DRV 38RSSA Elite Suites2016 Smart Prime Link to comment Share on other sites More sharing options...
bluflame11 Posted September 6, 2017 Author Report Share Posted September 6, 2017 On a normal cruise it runs 170-180 I believe... I hands tried down shifting, ruining in "low", easing off the throttle, nothing seems to change it.... As far as rpm, it is probably around 14-1500, maybe upwards of 2000 if i downshift. I believe the fan is engaging around 210ish Link to comment Share on other sites More sharing options...
bluflame11 Posted September 6, 2017 Author Report Share Posted September 6, 2017 2 minutes ago, GeorgiaHybrid said: Besides those, I would check the radiator flow and make sure it is not clogged with something and check on the thermostat. You could also have a problem with the water pump. Thanks! What's the best way to check these? Link to comment Share on other sites More sharing options...
rickeieio Posted September 6, 2017 Report Share Posted September 6, 2017 Check the simple stuff first. If you can, take a garden hose and clean the radiator. Flush from both directions. You may be surprised at the dead bugs that come out. Also take a flashlight and look between the various elements of the cooling "stack". there may be some leaves or other debris hiding in there. One time my uncle was complaining his a/c wasn't working properly. (Old Ford with a 6.9) I popped the hood and found a piece of cardboard he'd shoved in the previous winter. Easy fix...... KW T-680, POPEMOBILE Newmar X-Aire, VATICAN Lots of old motorcycles, Moto Guzzi Griso and Spyder F3 currently in the front row Young enough to play in the dirt as a retired farmer. contact me at rickeieio1@comcast.net Link to comment Share on other sites More sharing options...
GeorgiaHybrid Posted September 6, 2017 Report Share Posted September 6, 2017 Remove the radiator and have it flushed out. If you don't know when the thermostat was changed, I would be proactive and change it out as the cost is minimal if you do it yourself. Make SURE that the fan clutch is working correctly and locking up when needed. 2017 Kenworth T6802015 DRV 38RSSA Elite Suites2016 Smart Prime Link to comment Share on other sites More sharing options...
GeorgiaHybrid Posted September 6, 2017 Report Share Posted September 6, 2017 Like above, I use a pressure washer with the low power nozzle on it (wash nozzle) to blow the bugs and crap out from the rear to the front first and then the reverse way a few times. You have an intercooler, AC Evaporator coil and the radiator in that stack. It will take a bit to clean it out if it has been a while since it was done. 2017 Kenworth T6802015 DRV 38RSSA Elite Suites2016 Smart Prime Link to comment Share on other sites More sharing options...
MrSeas Posted September 6, 2017 Report Share Posted September 6, 2017 Don't need to put it in " low" just downshift to 9th or 8th in manual mode. If you are running 1400 RPM's in 10th going up a hill you must really want to get there in a hurry. Sometimes it's ok not to be first. A/C on? Oil temp? Coolant Level? Can you turn your engine fan by hand? Belts? Link to comment Share on other sites More sharing options...
bluflame11 Posted September 7, 2017 Author Report Share Posted September 7, 2017 A.c. was on , coolant level is good, not sure of oil temp Link to comment Share on other sites More sharing options...
Alie&Jim's Carrilite Posted September 7, 2017 Report Share Posted September 7, 2017 Sounds like the fan clutch isn't working. Alie & Jim + 8 paws 2017 DRV Memphis BART- 1998 Volvo 610 Lil'ole 6cyl Cummins Link to comment Share on other sites More sharing options...
I'mdonewiththis forum Posted September 7, 2017 Report Share Posted September 7, 2017 40 minutes ago, Alie&Jim's Carrilite said: Sounds like the fan clutch isn't working. Or the radiator is plugged. That would be my next thing to check, then the thermostat, although any I have seen fail have failed open. Link to comment Share on other sites More sharing options...
Brad & Jacolyn Posted September 7, 2017 Report Share Posted September 7, 2017 This is the order I would check. Sounds like a partially plugged Rad. to me. Hose out good first from front and rear a few times. If the fan is kicking in you will hear it. Mine kicks in about 200 - 210 degrees. If that doesn't help I would change the thermostat and after that have the rad. flushed. After that I don't know. Good luck. Brad Brad and Jacolyn Tucker the Wonder dog and Brynn the Norfolk Terrier 2009 Smart "Joy" 2004 VNL630 "Vonda the Volvo" 2008 Hitch Hiker 35 CK Champagne Edition VED12 465 HP, Freedomline, 3.73 ratio, WB 218" Fulltiming and loving it. Link to comment Share on other sites More sharing options...
Pete Kildow Posted September 7, 2017 Report Share Posted September 7, 2017 Next time you have the truck up to temps. Check the lower radiator hose temps? See if its hot or cool, if its hot you know its flowing water. Sounds like the cooling system is clogged somewhere. That or you have a leak on the air to air somewhere. That will make low boost, and can make a truck run hot. Also you may think the cooling fan is working. But some just kick on, but slip enough to not cool right. Also some of the volvo D12 and D13's had issues with the water pumps. The impeller will spin and do OK. But at a load, spin on the shalt. Thus not cool, most have issues even on flat ground with temps though. Pete Link to comment Share on other sites More sharing options...
bluflame11 Posted September 8, 2017 Author Report Share Posted September 8, 2017 4 hours ago, Pete Kildow said: Next time you have the truck up to temps. Check the lower radiator hose temps? See if its hot or cool, if its hot you know its flowing water. Sounds like the cooling system is clogged somewhere. That or you have a leak on the air to air somewhere. That will make low boost, and can make a truck run hot. Also you may think the cooling fan is working. But some just kick on, but slip enough to not cool right. Also some of the volvo D12 and D13's had issues with the water pumps. The impeller will spin and do OK. But at a load, spin on the shalt. Thus not cool, most have issues even on flat ground with temps though. Pete Thanks! I'll check these things.... how much boost should I see? Link to comment Share on other sites More sharing options...
noteven Posted September 8, 2017 Report Share Posted September 8, 2017 1st. - Gently clean the a/c condensor, charge air cooler, and radiator. Beware the urge to git er done and pressure warsh incorrectly and smash little fins flat. If the truck has always operated where there are no insects, skip step 1. 2nd - Wonder why Volvo didn't build with a manual fan switch. 3rd - Leave the truck fast idling for a bit with the a/c on - this should cause the engine fan to engage if it is working. Or 3rd - go for a spin upa big grade again this is more fun than running the engine parked - see if fan engages. Wonder again why the truck has no switch... If all of the above is in order then start taking the truck apart, looking on the internet .... You should be able to floor it up any grade in the land with a class 8 and a rv trailer load with zero fuss from the cooling system. "Are we there yet?" asked no motorcycle rider, ever. Link to comment Share on other sites More sharing options...
Stan Wright Posted September 8, 2017 Report Share Posted September 8, 2017 49 minutes ago, noteven said: ...2nd - Wonder why Volvo didn't build with a manual fan switch.... I found a relatively easy way to add a manual switch: http://hdt.eurekaboy.com/fanswitch.htm Link to comment Share on other sites More sharing options...
Brad & Jacolyn Posted September 8, 2017 Report Share Posted September 8, 2017 Just thought of this. Could the Rad. hoses be getting old and soft and compress under load and restrict the amount of flow? Just thinking out loud. Brad Brad and Jacolyn Tucker the Wonder dog and Brynn the Norfolk Terrier 2009 Smart "Joy" 2004 VNL630 "Vonda the Volvo" 2008 Hitch Hiker 35 CK Champagne Edition VED12 465 HP, Freedomline, 3.73 ratio, WB 218" Fulltiming and loving it. Link to comment Share on other sites More sharing options...
Jaydrvr Posted September 8, 2017 Report Share Posted September 8, 2017 If the usual suspects check out, i.e. radiator, thermostat and fan clutch, I would encourage you to test the air to air intercooler. It's often overlooked in this scenario and I've personally experienced how much it can impact the ability to climb hills. Link to comment Share on other sites More sharing options...
bluflame11 Posted September 8, 2017 Author Report Share Posted September 8, 2017 6 hours ago, noteven said: You should be able to floor it up any grade in the land with a class 8 and a rv trailer load with zero fuss from the cooling system. I always thought that is the way it should be, but I am inexperienced.... not necessarily trying to pass everything on the hill, but always thought it should cruise right up with the rv without any issues! Link to comment Share on other sites More sharing options...
Pete Kildow Posted September 10, 2017 Report Share Posted September 10, 2017 On 9/7/2017 at 9:44 PM, bluflame11 said: Thanks! I'll check these things.... how much boost should I see? Not sure on that, as it depends on HP of the engine. But should be max around 30+. Link to comment Share on other sites More sharing options...
SKP038620 Posted September 10, 2017 Report Share Posted September 10, 2017 Not an hdt owner but do have a mid 4700 low-pro. When my temps get high as have been discussed have changed the cap on coolant system . Its a 10lb cap. easy fix.. Jim S Link to comment Share on other sites More sharing options...
noteven Posted September 10, 2017 Report Share Posted September 10, 2017 1 hour ago, SKP038620 said: Not an hdt owner but do have a mid 4700 low-pro. When my temps get high as have been discussed have changed the cap on coolant system . Its a 10lb cap. easy fix.. Jim S This is an often overlooked cooling system component... "Are we there yet?" asked no motorcycle rider, ever. Link to comment Share on other sites More sharing options...
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