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Old 06-17-2021, 06:05 PM   #1
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Engine heat question

400 ISL usually temps out at 187-190 on a 70-80 degree day up or down hill. Today coming back from Half Moon Bay outside temp climbed to 100-102. Some small hills Iíve been over before no big deal. I kept an eye on the dash gauge as well as the Aladdin read out. The engine temp climbed up to 205, 208, and as high as 212. Turbo boost was 75-100% on some of the hills. I pulled over and sat several times until temp was down to 190. Then back to the same scenario. Is this common. Recent oil/filters change, new air cleaner, coolant right in the middle of overflow tank. Hydraulic fluid good. Hydraulic fan functioning good. Maybe I need to clean my radiator which I have never been done since Im the second owner as of 3/2018. Any ideas? By the way I am towing my Jeep.
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Old 06-17-2021, 07:44 PM   #2
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My coach engine temp has always been rock steady, all temps, all boosts, all grades. The only exception was when we had a rock hole the radiator. The temp would then rise on uphills and go back down on the downhills. The coolant was low causing the fluctuation.
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Old 06-17-2021, 07:56 PM   #3
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Not sure if you have a side or rear radiator. Checking cleanliness canít hurt. Not as familiar with Cummings as I have a C13 Cat but exceeding 220 can lead to a cracked head. Be careful until you get to the root cause.
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Old 06-18-2021, 07:17 AM   #4
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Quote:
Originally Posted by DaveBunker View Post
400 ISL usually temps out at 187-190 on a 70-80 degree day up or down hill. Today coming back from Half Moon Bay outside temp climbed to 100-102. Some small hills Iíve been over before no big deal. I kept an eye on the dash gauge as well as the Aladdin read out. The engine temp climbed up to 205, 208, and as high as 212. Turbo boost was 75-100% on some of the hills. I pulled over and sat several times until temp was down to 190. Then back to the same scenario. Is this common. Recent oil/filters change, new air cleaner, coolant right in the middle of overflow tank. Hydraulic fluid good. Hydraulic fan functioning good. Maybe I need to clean my radiator which I have never been done since Im the second owner as of 3/2018. Any ideas? By the way I am towing my Jeep.
You didn't mention anything about RPM's. Are you manually down shifting to keep them up near 2000? Lugging the engine and letting the trans shift itself will raise the engine temperature pretty quickly.
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Old 06-18-2021, 09:07 AM   #5
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Yes I was. Sometimes all the way down into 2nd gear and keeping the rpms right around 18-2100,
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Old 06-18-2021, 09:15 AM   #6
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Cummins , says to clean a rear rad annually or every 7500 miles . I use the same schedule for my side rad.
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Old 06-18-2021, 11:19 AM   #7
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Cleaning your side radiator sure can't hurt. Lots of reading on how to do it. I use the simple green but get the one that's safe for aluminum and I don't like using a pressure washer. Radiator fins are easily damaged.

I'd also consider changing the engine thermostat. Maybe all the coolant too if it's original.
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Old 06-18-2021, 12:49 PM   #8
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Sound normal to me 195 degree thermostat outside temperature that hot pulling . Are coach does get that warm pulling when outside temperature that hot so does the driver.
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Old 06-18-2021, 12:52 PM   #9
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Quote:
Originally Posted by DaveBunker View Post
400 ISL usually temps out at 187-190 on a 70-80 degree day up or down hill. Today coming back from Half Moon Bay outside temp climbed to 100-102. Some small hills Iíve been over before no big deal. I kept an eye on the dash gauge as well as the Aladdin read out. The engine temp climbed up to 205, 208, and as high as 212. Turbo boost was 75-100% on some of the hills. I pulled over and sat several times until temp was down to 190. Then back to the same scenario. Is this common. Recent oil/filters change, new air cleaner, coolant right in the middle of overflow tank. Hydraulic fluid good. Hydraulic fan functioning good. Maybe I need to clean my radiator which I have never been done since Im the second owner as of 3/2018. Any ideas? By the way I am towing my Jeep.


Clean the radiator, as Windsorbill said, there is a lot on this forum about how to do it including a post from in the last few weeks.
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Old 06-19-2021, 06:52 AM   #10
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This could be your problem

https://www.irv2.com/forums/f115/ove...-541376-2.html
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