I have a O6 F250. Egr delete and a new oil cooler 20k ago.
I have been dealing with missing coolant for about 6 months. A little here or there but it has gotten really bad the last few weeks. My last attempt was to replace the degass cap. Stopped the missing coolant for a 30 mile trip. Just to clarify it had gotten to the point I was adding one gallon per 20 miles. Needless to say I was thrilled. Next morning I came out to find coolant under the truck. Plastic Y under degass, so I replaced it. 25 miles and none missing. Next morning fluid under the truck. Now it's the egr hose. Replaced it with a gates hose and new clamps. Fill it up with coolant go inside and its leaking in the same location. Anyone who has done this knows its a pure pleasure to undertake. So I assume these leaks weren't previously leaking because the degass cap wasn't pressurizing the system. That being said the leak is on the oil cooler side of the egr hose. The snap lock fitting that was on the original housing spins around. Should that locking mechanism be removed before the hose is secured and clamped? This is the only thing I can come up with as the culprit. I have searched the information on the site but can't find any mention of it needing to be removed. The clamps are the right width and everything is seated. Any help would be a godsend!

 

https://www.youtube.com/watch?v=Gvdj...k#action=share

idk if this will help you?