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Old 05-14-2021, 07:10 PM   #15
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My 2011 MaxForce 10 looks exactly like your video, normal operation!!!
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Old 05-14-2021, 07:17 PM   #16
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I should have also said that the coolant is not boiling. What you are seeing is the coolant is pulled out of the tank through the bottom hose and retuned via the top hose. What looks like boiling is the coolant dropping through the baffles in the tank.
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Old 05-14-2021, 07:25 PM   #17
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I should have also said that the coolant is not boiling. What you are seeing is the coolant is pulled out of the tank through the bottom hose and retuned via the top hose. What looks like boiling is the coolant dropping through the baffles in the tank.

Thanks for the explanation.


That sure makes more sense than either coolant boiling or a pretty substantial introduction of air into the coolant. Neither of which is desirable.
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Old 05-15-2021, 09:08 AM   #18
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Thank you for responding! I haven't ever had the access door open and looking at the coolant container when running the engine. With the initial loss of power issue and noticing the coolant flow, I thought there was a problem.
While troubleshooting, the tech tried to remove the EGR valve to look for possible liquid in the exhaust, and broke it. Returning on Monday with a new one ($714) to install.

The repair tech thinks the cold weather in Feb may have caused the diesel to gel in the filters/screen.

Thanks, Randy
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Old 05-15-2021, 09:21 AM   #19
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Sounds like a blown head gasket to me or something similar that is allowing cylinder compression to bleed over to the coolant jacket
+2 that what my mine have done when the head gasket went
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Old 05-18-2021, 06:00 PM   #20
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That does not look like it is boiling. That is how much antifreeze/water is circulating. Mine always looked like that with the engine running. Is the coolant coming out of the cap? Stan
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Old 05-20-2021, 03:20 PM   #21
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I used the term boiling to describe what it looks like. It was not boiling from heat. I have never seen any engine/vehicle that did this, and evidently I have never opened the rear access door while the engine was running.
I talked to the service dept at two different International dealers and the mobile tech who came to work on it, and none of them thought this normal? Seeing this and the fact that it had no power, I thought I had a serious issue. When I did some research, it appeared that the EGR cooler or the air compressor (liquid cooled) was leaking pressure into the cooling system and pressurizing the coolant tank.

Utube videos of coolant tank boiling, bubbling, churning on Navistar and Cumins engines was diagnosed as either EGR cooler leaking or a blown head gasket being the cause.
After noticing that the turbo boost pressure was low when I tried to climb the hill in my driveway, I changed out the secondary fuel filter and cleaned out the pump screen. That restored the power issue to normal.
The mobile tech, who wasn't very experienced with Maxforce 10 engines, decided to pull the EGR valve to check for moisture in the EGR cooler without the proper puller. In doing so he broke the EGR valve with it partially out out of the housing. He showed up this morning with a new EGR valve ($714) and the correct puller. He also talked to a coworker who appears to be only Maxforce mech that knew that the coolant tank flow was indeed normal. So, the old EGR valve was removed without damaging the housing and a new one installed. He also got in trouble with his boss for working on an RV and was told to get through with it. They told me on the phone that they do not work on RVs, but when I asked about a mobile mech, the gladly provided his name and number??

Just took a 20 mile test drive and it appears that everything is working fine. This took one week to get resolved. Sure glad I wasn't on the side of the road and I'm glad this ordeal is over!
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