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Old 10-05-2018, 10:06 AM   #1
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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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Old 10-05-2018, 10:12 AM   #2
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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.
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Old 10-05-2018, 11:24 AM   #3
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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.
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Old 10-06-2018, 01:13 PM   #4
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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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Old 10-06-2018, 03:30 PM   #5
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Originally Posted by KiheiKen View Post
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.
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
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Old 11-09-2018, 08:30 AM   #6
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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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Old 04-04-2019, 09:04 PM   #7
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Finally resolved. Replaced thermostat and new radiator cap and no more overheating.
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Old 04-04-2019, 10:54 PM   #8
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.............. Since diesel pushers evacuate air from the engine compartment it pushes this soot into the radiator and is not visible from the exterior.............

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
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Old 04-05-2019, 09:11 AM   #9
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Finally resolved. Replaced thermostat and new radiator cap and no more overheating.
That's awesome...you got off lucky. Mine was a defective Horton fan clutch. I had also replacement thermostat prior. Good for you.
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Old 04-07-2019, 10:35 PM   #10
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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,
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