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DD60 coolant loss out overflow

I have a 1994 Freightliner FLD120 with a series 60 Detroit in it. The truck is very low millage 550,00 acording to the ECM. I have put about 10,000 miles on this truck since I bought it 2 months ago and have noticed a little problem I see a little coolant leaking out of the overflow every now and then and I will get a check engine light. I add about 2 quarts of coolant and the light goes out. It will still leak a small amount of coolant out of the overflow every once and a while then after about 2,000 miles or so the light will come on and I will add a quart or two of coolant. I replaced the radiator cap and that did not help. The original radiator cap was 10 psi and I just bought a 16 psi cap thinking this might solve the problem. Is this pressure too high??I was worried about a head gasket but the coolant and oil do not look to be cross contaminated. I also do not see any bubbles in the tank while the engine is running. I had the oil analyised 10,000 miles ago when I first bought the Truck and everthing was fine. The truck runs great mantains 180 degrees water temp. I have heard that my truck has a air valve that controls the bunk heater and that this can fail and cause air to pressureize the cooling system and cause a problem like mine. Any advice or suggestions would be welcome

Thanks Kerry

Answer this question I have this problem too

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Jerzy That is a good point I might be overfilling it as I bring it right up to the lip on the cap and there is no room for expansion. I was doing that because of the check engine light codes said low coolant level I will try leaving the level alone and changing the sensor. Have a dumb question where is the add line?

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When it leaks out does it go below add line? Maybe you add too much coolant and that's why it leaks out? Detroits are notorious for the coolant level sensor going bad.

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Jerzy just added a comment in the wrong place check out my original post Thanks

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if you have the plastic reservoir there should be 2 lines on the front it (upper one for full and lower one for add), if you have the og metal one like mine there should be a sight glass there.

before you get a new sensor stick a metal paper clip or piece of wire from one receptical to the other in the plug to jump it - will keep the ecm thinking everything is well and from potentially shutting down the engine.

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Thanks I will try that I am starting to wonder if I have another problem When the mechanic read the codes I did not have an active code but the history showed

Status Desc. Flash Code Lookup Code FMI Count

Inactive low colant level 43 PID111 1 2

Inactive ECM BAt Volt Low 46 PID168 1 3

Inactive EEPROM Write Error 53 SID253 12 6

I have been surfing the internet and I am getting the impression a low coolant error will shut down the engine I am getting a check engine light and the above codes are what showed up but the engine never shuts down.I am thinking that it may not be a low coolant code after all and when I shut down the engine to let it cool and add coolant it is reseting the computer.

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I sure messed that up I had everthing lined up in colums all codes are inactive ----Coolant level low FC 43 Lookup PID111 FMI 1 Count 2--- ECM Battery Voltage Low FC 46 Lookup PID168 FMI 1 Count 3 ----EEPROM Write Error FC 53 Lookup SID253 FMI 12 Count 6----

Thanks for the help

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You might consider spending 43 dollars go to napa auto parts and get a combustion leak tester and check to see if there any combustion gases in the cooling system. It can also be a air compressor putting pressure in the cooling system. You mention the heating system that's true it will do that. If you have shut off valves on the engine for your heating system shut those off and see if it makes a difference.

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Hello i also have the same problem .. Im thinking on fixing the engine no sure if there is something else i could do . did you fix it? And what was it?

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i did have that problem with my dd60 truck. put the overflow tube into a gallon bottle, tie it up some place. if it is blowing out under compression going down the road in the bottle. you have a big problem. it is coming out between the piston linings or sleeves. check your mechanic.

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I have a 1997 kenworth t800 it has 912698 miles on it and also Detroit 60 series init I can start it up let it idle. 2 to 3 mins its at 200 if I drive it it gets up to 250 and even with fan running it won't cool down any ideas .I burped the system a few times it helped but it won't cool down and also I'm having ecm malfunctions fault aux high out put I'm having ecm problems I have no idea on what to do I'm kinda afraid to see how much all this is going to be any ideas on how to bypass or see if maybe one of you guys would help

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Kerry Tate will be eternally grateful.
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