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Old 06-10-2018, 12:43 PM   #1
Mini-Skoolie
 
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Year: 2001
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On the road need help!

I'm driving a 2001 bluebird freightliner Cummins 6 cylinder diesel. It weighs a little over 17,000 lb empty. We're driving through Kentucky up and down the Hills on I-65 midday and the engine is fluctuating between 200 and 220 degrees. 220 up hills and 200 degrees going down Hills . Check the fan it's running fine just had it serviced by a mechanic before we left Iowa. Ran all night in the cool weather perfectly fine. The current temperature outside right now is 90 degrees. I've been keeping it at a fairly steady 65 miles an hour. Am I running it a little too hard? Should I drop down to 55 miles per hour?

Pulled over to a flying j waited 30 min engine dropped to 170. Drove 1 mile and it shot back up to 200. Pulled off to a Walmart waiting an hour to cool. Anyone else have this problem? Should I worry?
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Old 06-10-2018, 01:36 PM   #2
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As long as it doesn't go higher it won't be critical. As long as it's going up and down it should be okay. If t starts to rise from there, shut it down and diagnose the issue.
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Old 06-10-2018, 02:44 PM   #3
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220

220 degrees is upper limit but within limit. over that shut it down and let cool.

do you have a coolant overflow tank on this cooling system? can you see the level in the overflow tank? is the tank under pressure?


do not open a hot pressurized over flow tank!!!

william.

you can band aid... move wiper washer jets to in front of radiator, spray water on the radiator to help shed heat.. at 50 percent alcohol to cool even more.. again band aid..
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Old 06-10-2018, 02:49 PM   #4
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I would hate to see 220 and for sure would slow down. what is the use of 65 if you have to stop and worry while 50 -55 will keep it at 200?

later J
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Old 06-10-2018, 04:52 PM   #5
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You say that you had some recent service done to it? What was done? And I'm assuming your talking about coolant temp and not oil temp right?
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Old 06-10-2018, 07:22 PM   #6
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If slowing down brings your temp down, do that until you get where you're going and can spend real time diagnosing it. You may just be spinning too many RPM or going too fast with an AT545!
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Old 06-13-2018, 10:31 AM   #7
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Made it to Gainesville! I just drove at night when the temperature was cooler. It was still running hot at 55 mph. Speed made no difference. What's the best way to diagnose the problem? Fluids are good. Fan is running. So it's maybe the radiator or the thermostat. How do I find out?
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Old 06-13-2018, 12:24 PM   #8
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when you say "the fan is running" is it just spinning or is it roaring like a loud jet engine when you are at 220 degrees? a viscous fan clutch.. even a bad one.. will usually let the fan spin some just not enough, you'll feel air.. but on my DEV bus when I hit the hills with my foot buried in it.. ill slowly hear that fan ramp up to a good sounding roar... and if i stop and open the hood and rev it.. its really loud till the temp drops a bit...


-Christopher
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Old 06-13-2018, 01:19 PM   #9
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Quote:
Originally Posted by Anthrobus View Post
Made it to Gainesville! I just drove at night when the temperature was cooler. It was still running hot at 55 mph. Speed made no difference. What's the best way to diagnose the problem? Fluids are good. Fan is running. So it's maybe the radiator or the thermostat. How do I find out?
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Old 06-21-2018, 03:23 PM   #10
Mini-Skoolie
 
Join Date: May 2018
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Engine: Cummings 6 cylinder diesel
Quote:
Originally Posted by cadillackid View Post
when you say "the fan is running" is it just spinning or is it roaring like a loud jet engine when you are at 220 degrees? a viscous fan clutch.. even a bad one.. will usually let the fan spin some just not enough, you'll feel air.. but on my DEV bus when I hit the hills with my foot buried in it.. ill slowly hear that fan ramp up to a good sounding roar... and if i stop and open the hood and rev it.. its really loud till the temp drops a bit...


-Christopher
Yeah we dropped a new fan clutch in and a new 180 thermostat. Still running 200 degrees but it's 100 plus here.
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