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Discussion Starter #1
08 6.4l I took it to a local mechanic to check on a leak . It only leaks when warm/cold . He pressure tested it and said it was holding pressure, and when I open the degreaser box cap I do hear pressure escape but there is a puddle. He and I can't see the leak. it looks like it's high up and deep in the engine. Any suggestions ?
 

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Where's the puddle when truck is parked...front, rear, left right etc? Have coolant hoses been updated? Original hoses(black ends) had 1 o ring and were known to leak. Updated hoses (white ends) have 2 o rings.
 

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Check the hoses under the degas bottle and the hoses that connect to the egr coolers. Is he pressure testing when the truck is hot or cold?
 

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Discussion Starter #4
He checked hot and if I go on a 2 or more hour drive it doesn't leak. Even when cold when I open the degas cap I hear pressure escape.
So I took out the bat and degas , the hoses looked good but I suspect it's the hose to the bottom of the degas because it has a rusty spring clamp so I put another regular hose clamp next to it, on both ends.
Update. Still leaks but much less.I plan to have all hoses replaced
 
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