overheating cummings

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CamoDieselPower

Junior Member
Joined
Mar 4, 2014
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Location
Gulfport, MS
Ram Year
2008
Engine
Cummings 6.7
when i go down the road the truck overheats and shoots out the coolant out of the reservoir untill there is about 1/4 of the coolant left in the radiator. when i slow down the truck cools down. im not getting any white smoke coming out of the exhaust. i have already replaced the water pump cause it got messed up and have already replaced the radiator and it still overheats.
 

Power247

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Jul 26, 2012
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Location
High Point, NC
Ram Year
2019
Engine
6.4 HEMI
Welcome to RF... I didn't see you mention so I thought I would ask the simple first... How about the thermostat? Did you replace it with the radiator or water pump? Hoses too?

Also, you said no white smoke but are you getting and water in you engine oil?

sent thru a cloud of smoke
 

NWRQC

Senior Member
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Sep 5, 2011
Posts
842
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Ram Year
2007
Engine
6.7 Cummins
What about any mods to your truck? You provide very little info in your post.
 

NYCruiser

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Location
Yonkers, NY
Ram Year
2014
Engine
Hemi 5.7
How many miles? I've seen some tired diesels in the big rigs overheat under load from combustion gas getting into the coolant. Hope that's not the case.
 

DannyMK2

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Long Island, NY
Ram Year
2015 Power Wagon
Engine
6.4 Hemi
this is probably a dumb question, but did you bleed the air out of the system when you changed the water pump and radiator?
 

smykowski

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Nov 30, 2010
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Location
Pacific, MO
Ram Year
2010 SLT
Engine
6.7L Cummins
The overheating part would make sense if there were air trapped in the cooling system. The fact that the system is becoming pressurized to the point it forces practically all the coolant out, sounds like the cooling system is part of the combustion chamber. BUT, you are right, bleeding the cooling system is good (and cheap) troubleshooting step vs. a new hg.
 
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Soddy

Junior Member
Joined
Sep 17, 2012
Posts
7
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Location
Granville
Ram Year
2011.5
Engine
6.7 Turbo Diesel
Sounds like a head gasket to me, especially if truck is deleted and running high timing. What was going on when this first started happening?
 

dmuney

Member
Joined
Mar 2, 2016
Posts
38
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6
Ram Year
2005
Engine
5.9L HO Cummins
Sounds like you shouldn't drive it any more it's either head gasket or possibly a cracked cylinder head


05 Ram 5.9 Cummins Sundown Audio Old School PPI
 
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