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Old 08-01-2015, 02:59 PM   #1
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Overheating in the hills:

Drove the 2003 Dutch Star 400 miles from Salt Lake City last week. Started to overheat in the mountains. Outside temp was 85-90. Semis were going 35-45 mph. Pulled over to cool off. From there I down shifted earlier than before. Still overheated but not as bad. Mechanic here says problem is the radiator being plugged or corroded.
Any ideas or similar experiences?
Thanks, Larry
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Old 08-01-2015, 03:14 PM   #2
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Quote:
Originally Posted by lkhoffman View Post
Drove the 2003 Dutch Star 400 miles from Salt Lake City last week. Started to overheat in the mountains. Outside temp was 85-90. Semis were going 35-45 mph. Pulled over to cool off. From there I down shifted earlier than before. Still overheated but not as bad. Mechanic here says problem is the radiator being plugged or corroded.
Any ideas or similar experiences?
Thanks, Larry
Larry
See: Cleaning The Radiator & CAC - Engines - FMCA Motorhome Forums
and/or Google "cleaning rv radiator".
Mel
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Old 08-01-2015, 07:16 PM   #3
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#1 Clean the radiator

#2 Clean it again

#3 Relocate the slobber tube

#4 Turn off the dash aircon when going up hills on hot days

#5 Slow down and Manually select lower gear to keep revs above 2000rpm

#6 keep an eye on the engine and transmission temperatures and slow down some more if necessary.

#7 clean the radiator again and this time remember it is a radiator plus CAC so it takes a lot of effort to get it clean.

#8 slow down up steep hills on hot days
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Old 08-01-2015, 07:20 PM   #4
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Quote:
Originally Posted by Tony Lee View Post
#1 Clean the radiator

#2 Clean it again

#3 Relocate the slobber tube

#4 Turn off the dash aircon when going up hills on hot days

#5 Slow down and Manually select lower gear to keep revs above 2000rpm

#6 keep an eye on the engine and transmission temperatures and slow down some more if necessary.

#7 clean the radiator again and this time remember it is a radiator plus CAC so it takes a lot of effort to get it clean.

#8 slow down up steep hills on hot days

If the engine is a gaz engine, keep the revs above 3000 RPM !
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Old 08-01-2015, 11:54 PM   #5
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Quote:
Originally Posted by lkhoffman View Post
Drove the 2003 Dutch Star 400 miles from Salt Lake City last week. Started to overheat in the mountains. Outside temp was 85-90. Semis were going 35-45 mph. Pulled over to cool off. From there I down shifted earlier than before. Still overheated but not as bad. Mechanic here says problem is the radiator being plugged or corroded.
Any ideas or similar experiences?
Thanks, Larry
Is it a cummins 400 ISL with a side mounted radiator on a freightliner chassis if so there is a heating problem with some of those units. I think the 400 ISL through 2006.
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Old 08-02-2015, 06:28 AM   #6
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Don't use max boost. Use 3-4 psi less than the max, it will take a delicate touch. Do this in addition to what Tony Lee said.
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Old 08-02-2015, 09:17 AM   #7
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Just drove those same mountains 10 days ago. Alpine Coach 36ft. towing a 4 door jeep, with same engine and radiator set up. My temp gauge did not move.
Is your hydraulic radiator fan coming on. Something is wrong. I did flush out my system and replace coolant with an OAT coolant prior to my 4,000 mile trip, but I had no overheating issues prior either.

Frank
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Old 08-02-2015, 09:32 AM   #8
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Could be radiator is clogged, but you didn't say what RPM's you were running. As mentioned above keep the RPM's above 2000 to get max circulation.
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Old 08-02-2015, 10:40 AM   #9
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Gus if it is a Freightliner chassis with side mount engine all of your fixes will not help it is a design problem.
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Old 08-02-2015, 04:06 PM   #10
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Engine is cat 330 hp. Side radiator, freightliner chassis. Running around 1500 rpm. Thanks for help!
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Old 08-02-2015, 06:42 PM   #11
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Hot engine

I bought a used rv, with 454. Someone must have had problems with heating. It has a tube like ice maker, connected to water line and has a cut off valve installed in the line. Across the front of radiator is plastic pipe with jets pointed at the radiator. With pump on, when you need turn the valve and it sprays the radiator. Make sure engine radiator doesn't need cleaning.
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