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Old 08-06-2017, 09:32 AM   #1
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Tony49's Avatar
Monaco Owners Club
Join Date: Dec 2016
Location: Northern CA
Posts: 124
Water temperature

I have a Cummings 400 isl engine in my 2006 Monaco Diplomat. It has a rear radiator. Just trying to get some responses on what your normal water temperature is while running on a normal flat grade and what it climbs to while pulling a long 6% grade. Mine runs around 180 degrees on a flat grade and the highest I've seen it on a long 6% grade is 201 degrees.
Tony & Maryjane along with Sunny (Basset Hound)
2006 Monaco Diplomat 38PST, ISL 400
Toad-2014 Ford F-150 W/Air Force One Toad Brake
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Old 08-06-2017, 09:54 AM   #2
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Monaco Owners Club
Join Date: Feb 2015
Location: Colorado
Posts: 523
I have the same rig and mine runs in that same range. Last week we were on our way to the Black Hills and the outside temperature was close to 100. I saw a high of 206 on grades outside of Hot Springs SD. Highest I have seen so far.
2006 Monaco Diplomat
2017 JKU Sport Toad
and a garage full of Harleys
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Old 08-06-2017, 10:15 AM   #3
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Holiday Rambler Owners Club
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I see the same temperatures as Tony, with a side radiator.
Ben & Sharon
2008 43' Holiday Rambler Scepter PDQ
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Old 08-06-2017, 01:13 PM   #4
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Join Date: May 2014
Posts: 825
I have a 98 Dynasty 8.3 engine and last week climbing a long steep grade in the heat the engine climbed to about 207 and stayed there. It had been running at 180. A couple of
days ago the temperature was near freezing the temperature wouldn't get about 160
so when I get home this late fall I will change the thermostats as I don't like running the
engine that cool. I would like to run the engine at 190 but I can't get 190 thermostats
for the engine
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