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My Cummins is operating warm

Cummins isx operating temp on flat is about 200, soon as it goes to work on a low grade it climbs to 210 kicking on the engine fan and guzzling fuel. Under a hard pull it reaches 225 but never overheats.

Any Idear what the deal.

Drivers thanks for your time!

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8 Answers

I would start by checking the radiator to see if it is clear of bugs. have it steamed out from the front and back. Check the water temp gauge to make sure it is correctly reading temp and possible change the thermostat's. What is the year model of the truck? Check the top of the radiator and see if you can see any type of build up in the radiator.''italic text''

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Are you running the ac, any kind of pull will cause the fan to come on. Do you have a switch to control the fan on your isx, if not it is the ECM telling the fan to kick on. The cummins EGR motors like to run hot. You could try and see what the thermostat is set for by boiling some water, using a cooking thermometer, bring temp to 180 deg to start, put thermom. In water with the thermostat and note what temp it opens at. Then you can do one of two things, have shop set perams. On the ECM, or change to another temp thermostat... That is what I'd , and started using that new coolant. Engine runs hot, like it likes to, does not over heat, and fan does not come as much,( mine was really winding it when I used the ac) now I stay cool, engine stays at a temp it likes, and the ECM has no idea what is going on.....

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i would start with the radiator, as already mentioned. but i would consider pulling it and taking it to a shop that submerses it in a boiling bath to remove hard deposit buildup inside, as well as cleans the outside for maxixmum airflow. how old is the radiator? was there ever tap water used with concentrate? if it has a lot of miles, and tap water has been used before, then a bath seems likely to help. if your radiator has plastic tanks, they in general, are not as durable and start leaking before ones with metal tanks; in which case it might be more advisable to replace w/new. you can always run some cooling system flush at high idle, and blow out dirt and debris from front and back to see if this helps. if so, then you know that pulling and bathing or replacing likely won't be a waste of time and money.

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Hi go to your nearest cummins dealer and pick up a 4 litre jug of restore plus $40 great stuff acid flush pour top off with water cycle for 45 minutes then drain then add new antifreeze works great temperature came back to 195 to 205

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Big yes to the other answers about cleaning rad and intercooler etc...

if you have green coolant the EGR engines will steam out the water do a strip test and add Deionized water its cheap 1.99 a gal

if you have red and you have never changed it drain off 3gals and add fresh....

same with the yellow stuff too......

i chased this same problem....with the red ELC went to my Rad Man....he looked and to see if i did the do's lol seen all was clean did a test strip... instucted me to do this... and things went to normal....

Now now i do it every late spring re andre 3 and replace the rad cap.

Exhaust all the cheap fixes before you do the water pump or rad...

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I would start by replacing the thermostat, it won't hurt to put a new one in it see if it helps. If not check the radiator for debris between air charge cooler. If not try to clean the radiator from the inside, put a new coolant in it. I don't think it's the water pump cause on these engines if the pump goes out, you r done, you ain't going nowhere. There's also the worse case scenario - head gasket coolant going to the engine or opposite.

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I started to have the same problem on mine. I have the 2008 cummins on a peterbuilt 387. I replaced the thermostats flushed the radiator, put new red extended coolant. blew out the radiator and still have the problem. The weird thing is that it does not do it all the time. when its running cool temp. stays at 188 and will go up to 202 on small grades fuel millage will be at 7+. When it starts to run hot temp will be at 202 and will go up to 215 making fan start at 209 and fuel milage will be in the dumps at 4.5 to 5 mpg. any ideas what it could be?

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Have u still that problem ? I asked, because i did exactly the same things, but nothing helps. got now 800.000 clicks. so, next step i`ll replace the rad.

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I have the same problem. I change the turbo ,egr cooler,and I did a overhaul and still the same problem.

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I got a new air-to-air cooler.

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The problem is fixed by changing air cooler ?

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My isx15 never get over 190 on water and 200 on oil she never gets over 500 on EGTS she's a 2009 freightliner Cascadia 722,500 miles

Kyle hazard boise idaho

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We have the same issue with one of our Volvo's with 05 is 450. Installed new radiator turbo charge air cooler thermostat new ext life red coolant hoses ect. All new except water pump. Unit will get to 210 sitting on high idle not moving then fan kicks on cools to about 175-180 within 15-20 seconds then will slowly go back up. If a/c is on the high pressure switch will turn the fan on about every 2 minutes and keep temp under 200 . When unit pulls a grade temp will Spike to about 225 and set code for high coolant and oil temp. Unit will return to normal temp on level ground and stay around 190 while moving. Local Volvo dealer does not know why unit does this. Cummins said ecm may have issue in the program that is not telling the fan to come on at the correct temp. Still a work in progress at this time

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