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10-05-2018, 10:06 AM
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#1
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Member
Country Coach Owners Club
Join Date: Nov 2013
Posts: 53
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Cummins 400 Overheat
On flat road or grades my heat gauge shows the engine is getting up to 220 at times. Other times runs around 190. Coolant level good. Had overheat problem a year ago and replaced cracked exhaust manifold which solved that issue. Wondering if perhaps either the water pump is getting weak or possibly a temperature sending unit getting old. 85K miles. Does not heat up to dereg. Never goes over 220 even on stiff grades. Coasting or down hill always cools down.
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10-05-2018, 10:12 AM
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#2
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Senior Member
Newmar Owners Club
Join Date: Oct 2009
Posts: 10,310
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Has your Charge Air Cooler and the radiator ever been take out and cleaned?
I don't see how a cracked exhaust manifold could relate to the cooling system......and the coolant temps.
__________________
2012 Essex 4544 2011 Jeep JK, M&G Braking, 2014 MTI 27' Hog Hauler, Wireless brake control, 2006 Ultra & 1989 Springer, 2003 Harley-Davidson
FLHR Road King Anniversary
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10-05-2018, 11:24 AM
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#3
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Senior Member
Freightliner Owners Club
Join Date: Aug 2008
Location: Florida Keys
Posts: 2,687
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Your radiator is liking goobered up from all the road debris that catches up there. My ISL 400 needed a new radiator, etc. at about 90k miles and I had the same symptoms as you. I tried all the band-aid solutions (blow out the radiator, etc.) but you have bite the bullet and pull everything out which is expensive.
While everything was out, I had them change all the pulleys, water pump, thermostat, etc. while they had easy access. Final bill was about $8500.
Now it runs like a top and keeps the temp between 185-190 regardless of the terrain.
__________________
Tom and Katharine
'07 Winnebago Tour 40TD, 400hp Cummins
'17 Winnebago View 24V, '02 R-Vision B+
RVing for 20 years & 200,000+ miles
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10-06-2018, 01:13 PM
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#4
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Member
Country Coach Owners Club
Join Date: Nov 2013
Posts: 53
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the cracked manifold allowed the exhaust gases that drive the turbo to escape thus reducing the effectiveness of the turbo and making the engine work harder on pulls. That was a simple fix once I understood the mechanics behind turbo operation. The current issue, not so much.
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10-06-2018, 03:30 PM
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#5
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Senior Member
Join Date: Aug 2017
Posts: 249
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Quote:
Originally Posted by KiheiKen
On flat road or grades my heat gauge shows the engine is getting up to 220 at times. Other times runs around 190. Coolant level good. Had overheat problem a year ago and replaced cracked exhaust manifold which solved that issue. Wondering if perhaps either the water pump is getting weak or possibly a temperature sending unit getting old. 85K miles. Does not heat up to dereg. Never goes over 220 even on stiff grades. Coasting or down hill always cools down.
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Sounds like you need a new fan clutch. Had similar symptoms - flushed the cooling system, replaced the thermostat. No change. Then I drove it over to Freightliner and they found a leaking fan clutch. $1800 later, problem disappears. Good luck with getting yours back working again
__________________
Ted and Debbie
2008 Mandalay Coach Presidio 400
USMC VET
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11-09-2018, 08:30 AM
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#6
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Junior Member
Retired Fire Service RVer's American Coach Owners Club
Join Date: Sep 2018
Location: South Jersey
Posts: 21
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Overheating
Had same issue with exhaust leak. This allows soot to enter engine compartment. Since diesel pushers evacuate air from the engine compartment it pushes this soot into the radiator and is not visible from the exterior. I had to use a gal of degreaser to repeatedly soak and flush air charge cooler and radiator of the soot. Problem solved
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04-04-2019, 09:04 PM
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#7
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Member
Country Coach Owners Club
Join Date: Nov 2013
Posts: 53
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Finally resolved. Replaced thermostat and new radiator cap and no more overheating.
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04-04-2019, 10:54 PM
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#8
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Senior Member
Country Coach Owners Club
Join Date: Dec 2010
Posts: 7,804
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Quote:
Originally Posted by BB89SC
.............. Since diesel pushers evacuate air from the engine compartment it pushes this soot into the radiator and is not visible from the exterior.............
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In the case of a Country Coach, air is drawn in from the outside through the radiator, no way for soot to be pushed into the radiator
__________________
Don
2002 Country Coach Intrigue
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04-05-2019, 09:11 AM
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#9
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Senior Member
Fleetwood Owners Club Freightliner Owners Club
Join Date: Feb 2012
Location: Central Arkansas
Posts: 1,380
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Quote:
Originally Posted by KiheiKen
Finally resolved. Replaced thermostat and new radiator cap and no more overheating.
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That's awesome...you got off lucky. Mine was a defective Horton fan clutch. I had also replacement thermostat prior. Good for you.
__________________
2008 Fleetwood Bounder 38S 2022 Grand Cherokee WK Limited 2021 Polaris Slingshot R Limited
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04-07-2019, 10:35 PM
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#10
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Senior Member
Join Date: Aug 2010
Location: Over the next hill, around the next curve...
Posts: 5,663
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Glad your OK, and up and running. We have the ISL370 in our 04 Allure, built in Sept of 2003. As part of our maintenance when we bought the coach, we did a full drain, and distilled water flush, and shift to Peak Final charge. That by it self, lowered our standard operating temperatures quite a bit ! And as an ongoing maintenance activity, I buy a AC Coil Cleaner (Usually from either Lowes or Home Depot.), I spray a full can from the outside, and another full can from the inside of the radiator fans. Let it sit for awhile, and then flush with with a medium pressured spay of fresh water. Timing on this maintenance cleaning varies from as low as 12 months to 18 months - depending our our travels and weather and road conditions of the previous months of travel.
Best to all,
Smitty
__________________
07 Country Coach Magna Rembrandt 45' ISX600
Roo II was our 04 Country Coach Allure 40'
OnDRoad for The JRNY! Enjoy life...
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