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04-09-2017, 03:06 PM
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#1
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Member
Join Date: Oct 2012
Posts: 72
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Am I running too HOT?
Driving in W. Texas headed to New Mexico. Noticed my temp gauge needle floating between the A and L in "normal" range. Pulled over and put Scan Gauge on water temp. Here is what I saw: much of the time temp was between 200 - 204 range. Going up slight incline it would climb to 205 - 207. Then back down to 202. On longer slight inclines the temp would rise to 210,11, even 216 once. At higher temps I would pull over and let it cool down. I am driving at 65, hauling a small car and outside temp is 90. I am assuming I have a problem, right? Any suggestions? I am not opposed to using a truck repair shop in the town I am in. What is normal temp range for this engine? At 216 I was almost in the red spot of normal range on gauge. Any help would be appreciated. There is 91000 K on the engine.
Rich
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04-09-2017, 04:56 PM
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#2
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Senior Member
Monaco Owners Club
Join Date: Jun 2014
Posts: 14,494
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What engine do you have??? Hard to provide advice without this info!!
__________________
Jim J
2002 Monaco Windsor 38 PKD Cummins ISC 350 8.3L
2005 Jeep Grand Cherokee w/5.7 Hemi
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04-09-2017, 05:04 PM
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#3
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Member
Join Date: Oct 2012
Posts: 72
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Excellent point! This is a 5.9 ISB Cummins engine
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04-09-2017, 05:56 PM
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#4
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Senior Member
Fleetwood Owners Club
Join Date: Jun 2012
Location: Austin, TX
Posts: 879
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Nope, your all good, that motor runs hot, I have same. Did same thing, freaked myself out, wasted money on Silverleaf VMSpc, only to find out ISB runs hot.
I actually pulled into Cummins in Las Vegas on a trip to get some help. They told me motor would be fine running at 215 all day long, which was my highest temp.
Still kind of freaked out, changed all my fluids just to be super safe, didn't change anything.
Drive it like you stole my man.
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04-09-2017, 06:01 PM
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#5
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Senior Member
Join Date: Oct 2013
Posts: 387
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Sounds high to me. My Cummins ISC will de-rate at 220 (according to my manual). Have seen it go up to 210 on long uphill runs but typically stays in the 185-190 range running like you describe. The only exception is running into a stiff headwind where the boost stays WAY UP. Only way to deal with the headwind is to slow down!
Have you cleaned your radiator lately? Rear radiator coaches are infamous for clogging up the radiator. Side radiators are less likely to have a problem but still require periodic cleaning.
__________________
2005 Monaco Knight 40PLQ
2013 Ford Edge
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04-09-2017, 06:04 PM
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#6
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Senior Member
Join Date: Oct 2006
Location: Rochester NY
Posts: 2,706
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I think you're running hot. Call Cummins to verify what the correct operating range should be.
Chances are you have a clogged rear radiator which is not properly cooling the engine. There are lots of posts on this forum regarding this topic and how to remedy.
__________________
Don
'07 Winnebago Journey 34H - CAT C7, Koni's, MCU's, SS Bell Crank, Safe-T-Plus
'07 HHR Toad, SMI AFO, Blue OX
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04-09-2017, 06:07 PM
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#7
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Senior Member
Freightliner Owners Club
Join Date: Apr 2002
Location: Pensacola
Posts: 2,728
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Rich- I had a 2000 GeorgieBOy DP w/ Cummins 260 ISB. My temps normally stayed between between N&O on the gauge. Even on long grade it seldom reached straight up. One common problem during that period was grime collecting on the rear Radiator and blocking airflow. Periodic cleaning with simple green, flushing from both sides seemed to help. Temps are running a little high. Would look at cleaning. Caution to avoid bending radiator fins with pressure washer. Had that chassis and engine for 15 years.
From Freightliner:
My chassis used fig9 (before March 2000)
__________________
Hooligan, Pensacola, Fl -U.S. Coast Guard 1956-1985
2016 Thor Siesta Sprinter 24ST diesel -1972 Moto Guzzi
2008 Suzuki Grand Vitara TOAD
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04-09-2017, 06:44 PM
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#8
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Senior Member
Join Date: Jun 2011
Location: FL
Posts: 11,401
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How were your tranny temps? Sounds like things are working fine. If you were pulling hills at 65 I would slow down. You are burning a lot of hp to go from 55 to 65.
Be sure your radiator is clean of course.
__________________
Certified Senior Electronic Technician, Telecommunications Engineer, Telecommunications repair Service Center Owner, Original owner HR 2008
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04-09-2017, 06:52 PM
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#9
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,311
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Quote:
Originally Posted by YC1
Be sure your radiator is clean of course.
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X2.
Cummins says clean the rad on rear rad coaches every 7,500 miles , I'd add annually to that after seeing how bad a neighbors new rad looked after two years, with less than 7,000 miles.
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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04-09-2017, 08:04 PM
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#10
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Senior Member
Join Date: Oct 2013
Location: Houston
Posts: 1,374
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I have a 300HP 5.9 ISB. Mine runs 184F on that flats towing or not towing. On hills towing a 5000LB toad I've seen 200. I think yours sounds on the hot side. I keep my radiator clean which is key.
__________________
2002 Newmar Kountry Star 3669
Freightliner 300HP Cummins
Towing 2014 Honda CRV EX-L & 2010 Tundra W/Remco DD
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04-09-2017, 10:14 PM
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#11
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Senior Member
Winnebago Owners Club Ford Super Duty Owner
Join Date: Aug 2004
Location: Oregon
Posts: 2,728
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Is ours a DP or a FRED? No matter what I would clean the radiator just to make sure. But overall it sounds normal for a 5.9. Change you air filter also. My 3500 would run around that temperature when towing in the heat on hills but it would just crank up the fan and run like a bat out of hell. I will admit that I could not run the AC on high because it would get too darn cold. Mine I miss that truck.
205 temp running up hill seems normal in the heat of the summer with the AC running. Roll with it and drive it like you stole it.
__________________
Retired Navy Submariner
2014 Itasca Sunstar 35F; 5 Star tuned; 2014 Jeep Cherokee TrailHawk
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04-10-2017, 09:42 AM
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#12
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Member
Join Date: Oct 2012
Posts: 72
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Ok, checked with Cummings: recommended maximum heat is 212, so I do have an issue. Called Good Sam Club gave me the name of a repair shop 2 miles from my location, waiting for them to plug in and analyze. Will update when I learn more. Hoping cleaning radiator will do trick.
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04-10-2017, 11:30 AM
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#13
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RV Mutant #14
Winnebago Owners Club Texas Boomers Club Freightliner Owners Club iRV2 No Limits Club
Join Date: Aug 2008
Location: Texas
Posts: 17,189
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__________________
Wayne MSGT USMC (Ret) & Earlene (CinCHouse) RVM14 (ARS: KE5QG)
Lexi - Goldendoodle
2015 Winnebago Tour 42QD - 2020 Lincoln Nautilus Reserve
It is what it is, and then it is what you make of it.
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04-10-2017, 12:11 PM
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#14
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"Formerly Diplomat Don"
Newmar Owners Club
Join Date: Apr 2005
Location: Moorpark, Ca.
Posts: 23,922
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Even though someone said that engine runs hot, that's too hot. You're running above 200 on the flats, into the 210's on slight grades and even 216, what happens when you climb a steep grade. I'm guessing you'll be getting into overheat range. These engines want to crack exhaust manifolds when you run them hot.
If you don't know when the last cleaning of the radiator and charge air cooler occurred, that needs to be done before throwing money at other suspected issues.
__________________
Don & Mary
2019 Newmar Dutch Star 4018 (Freightliner)
2019 Ford Raptor
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