cummings running hot - Diesel Truck Forum -
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post #1 of 16 (permalink) Old 02-15-2010, 04:18 PM Thread Starter
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cummings running hot

i have a 1999 dodge ram 3500 ,its all stock,it pulls great use no oil or coolant has 220000 miles but it has always don this and so did my 1998. i have also talked to a few people around here who also have the same issue, when you pull a load up a long hill u drive by the temp gauge sure u have the power but cant use it because the temp gauge starts climbing fast i have never had a over heat but it gets to close for comfort so u got to back out and hold it around 35 mph i pull the same trailer up the same with my 454 i just grab a gear and hammer it no problem does any body know if this is a common issue with these as i have talked to several people with the same issue
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post #2 of 16 (permalink) Old 02-16-2010, 12:51 AM
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post #3 of 16 (permalink) Old 02-16-2010, 06:31 AM
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Have you checked the thermostat? Do you know what your EGT's are doing? Then I would wash out the radiator/intercooler/ac condensor. Then make sure your fan clutch engages.

And please, it's Cummins not Cummings.

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post #4 of 16 (permalink) Old 02-16-2010, 11:40 AM
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How high are you keeping the RPM?
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post #5 of 16 (permalink) Old 02-16-2010, 02:34 PM Thread Starter
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changed the t-stat clutch fans perfect external cores look good but i pulled it apart and washed them any way its almost impossible to get a good clean out without removing radiator so we will see if that helps any keeping rpms about 2000 to 2300.
i have been turnig wrenches commercially for 30 years now so i have checked all the normal things but i deffinately appreciate any and all suggestions
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post #6 of 16 (permalink) Old 02-16-2010, 06:41 PM
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On my 02 the fan clutch does not kick in until the water temp hits 195 and on a hot summer day pulling a 7K load it will come on, on the hills we have some 7% grades, and I can pull them running 70 mph with that load. The pyro will go up to 1100 sometimes a little higher but I am only running RV275 injectors, a edge comp box, and a 4 inch exhaust. So I am thinking you may want a timing box to advance your timing and cool thing off that way plus get a little better mileage.
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post #7 of 16 (permalink) Old 02-17-2010, 01:02 PM
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You say hot, how hot? The stock temp gauge leaves alot of room for guessing. I pull 20,000 and on hills the temp will climb no doubt but then it will level off and hold. I would suggest a edge juice with attitude then you have a better way to monitor what its doing and if you think it pulls now just wait! I always ran 454s before my Cummins and the are great for a gas engine,but use fuel,get hot, and after 200,000 its time for a fresh one. Your Cummins should out pull it and do it cooler.....get the edge and you wont be disappointed at all and I would watch the pyro and drive by that before the water temp and use that as a secondary. I think there might be something wrong with truck or maybe gauge or sending unit if it truly getting that hot, they dont run hot with light loads good luck

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post #8 of 16 (permalink) Old 02-21-2010, 08:12 PM
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I would remove the temp sensor, clean the threads on the sensor and where it screws in. Might not be making good contact.

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post #9 of 16 (permalink) Old 02-22-2010, 04:28 PM
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Steamclean the radiator. Just did it to mine and it makes all the difference.

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post #10 of 16 (permalink) Old 02-22-2010, 05:03 PM
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I think the problem is you have a cummings under your hood and not a cummins. Those darn knock off engines seem to be a big problem. It has something to do with the faulty flux capicters they installed into the doohicky.

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