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Old 07-30-2021, 04:07 PM   #1
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Join Date: Nov 2017
Location: Pennsylvania
Posts: 71
Year: 2000
Coachwork: Bluebird
Chassis: C1FE 2509
Engine: Cummins ISB 5.9L 24V ~ AT545
Rated Cap: Seats 5. Sleeps 4
Cummins 5.9 24V - What's a normal running temp?

Hey guys,

We've been loving our rig and are going on at least one trip every month.
With the summer's ambient temps hovering around 80-90F, the coolant temps now hover just under 220F. The clutched engine fan does kick in every once in a while keeping temps out of the 220s. This is at highway speeds holding 55-60mph.

We have a 2000 Cummins 5.9L ISB 24V mated to an Allison AT545(no surprises there, I know). The rig has a 26' transit/shuttle chassis. Weight-wise, we're at exactly 20,000lbs gross(including the finished conversion, passengers, a full tank of diesel, all of our stuff for the trip, and fresh water onboard)


Thoughts / Recommendations?

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Old 07-30-2021, 04:10 PM   #2
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Join Date: Jul 2017
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Year: 1993
Chassis: IH 3800
Engine: DT360
Rated Cap: 66
220 is warm but still safe. I'd probably give back flushing the radiator a shot. What I mean is use a pressure washer from the inside of the radiator (fan shroud side) to blow all the dirt, bugs, etc out of the front that have collected. Also check the coolant and make sure it's clean. May consider a change if it's been a while.
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Old 08-03-2021, 08:41 AM   #3
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Join Date: May 2015
Location: Miami, Fl.
Posts: 619
Year: 1999
Chassis: Amtran / International
Engine: DT466E-Md3060
Quote:
Originally Posted by Mr4btTahoe View Post
220 is warm but still safe. I'd probably give back flushing the radiator a shot. What I mean is use a pressure washer from the inside of the radiator (fan shroud side) to blow all the dirt, bugs, etc out of the front that have collected. Also check the coolant and make sure it's clean. May consider a change if it's been a while.
Cleaning the radiator is very good advice.
If you can't get the pressure washer wand in behind the radiator you might also consider using a/c coil cleaner and a garden hose. That too will accomplish the job!
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Old 08-03-2021, 09:19 AM   #4
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Join Date: May 2014
Location: West Ohio
Posts: 2,524
Year: 1984
Coachwork: Bluebird
Chassis: International 1753
Engine: 6.9 International
Rated Cap: 65
What rpm are you at while doing this? Trans shifting fine with no slippage?

It's warm, but with 90 degree exterior temps, an at545, and an engine running against the governor, it might be normal.
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