Mystery coolant leak - Dodge Cummins Diesel Forum
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post #1 of 20 (permalink) Old 10-22-2011, 11:32 PM Thread Starter
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Mystery coolant leak

Hey guys, so when my truck is nice and hot and I park it just after an all day trip including highway driving and around town driving, I have noticed a puddle of antifreeze under the truck in the morning. I have looked for this leak and I cant find anything both when I park the truck and in the morning. I also have put the clamp on the radiator overflow tube and at first I thought that solved it but it didn't work. So is there something that releases pressure and dumps it overboard? Or any ideas where I should look for this mystery leak. Thanks


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post #2 of 20 (permalink) Old 10-23-2011, 12:53 AM
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Check the 3 inch long rubber tube joining the two metal coolant pipes behind the turbo. This is a known leak point with symptoms exactly as you describe. I had this same problem. Put the new tubing and clamps on and problem fixed.

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post #3 of 20 (permalink) Old 10-23-2011, 12:00 PM Thread Starter
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Hey is there a way you can post a pic. I think I see what your saying but I am unsure. Thx.

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post #4 of 20 (permalink) Old 10-23-2011, 12:16 PM
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It'll be on the passenger side, between the turbo and the exhaust manifold. The hose will be foil wrapped with two worm gear clamps. Might get lucky and stop the leak by tightening the clamps.

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post #5 of 20 (permalink) Old 10-23-2011, 12:44 PM
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Here you go.




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post #6 of 20 (permalink) Old 10-23-2011, 05:28 PM
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Mine looks like replacement might be a good idea. Do you need to drain down the coolant level or will you just lose what is in the hose?
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post #7 of 20 (permalink) Old 10-23-2011, 05:46 PM
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Drain the coolant (heck may as well change it??) or your gonna loose coolant all over you and the garage floor.

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post #8 of 20 (permalink) Old 10-23-2011, 06:32 PM
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That is what I figured. Coolant was just changed.
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post #9 of 20 (permalink) Old 10-24-2011, 07:01 AM Thread Starter
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Awesome thanks guys! Wow not an easy fix! the gap the hose covers is like a 1/4" gap. I didn't drain the coolant also. Some drained out but not a ton. Loosen the one bolt and one nut that hold the aft section of tubing on. That gave me a little more room to play. Its not really a quick fix also, so do the change when you have some time and wont be rushed.

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post #10 of 20 (permalink) Old 10-24-2011, 03:13 PM
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Time for me to replace mine, where can one purchase one other than the stealership.TIA

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post #11 of 20 (permalink) Old 10-24-2011, 09:01 PM Thread Starter
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I bought and changed mine all in advanced auto's parking lot because my stupid apartment wont let me work on my trucks! Cant wait to be out of here and have my own garage!!!! the whole tube and new clamps was $4.

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post #12 of 20 (permalink) Old 06-12-2013, 03:41 PM
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Update...from someone who used all Genuine Cummins parts and tried hose clamps. Still leaked! Get the hose from Cummins/Mopar, it is a strange size. DO NOT USE CUMMINS SPRING CLAMPS. DO NOT USE A "REGULAR" HOSE CLAMP, they leaked too. Get the "constant torque" hose clamps. NAPA sells them, or a commercial truck supply. They look like a fully lined hose clamp, with a spring tensioner on the screw. Expensive, but you only need 2. This finally solved my coolant leak on the bypass hose.
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