Disappearing Coolant

[DrivingZiggy]

Well, I was under the truck today. So I looked for a leak at the bunk. Nope. So I went inside and looked under the bunk. Couldn't see anything, but I sure could smell it.

And I can't even find a radiator cap! Would I be pressurizing through the reservoir??? That doesn't seem right.

But the truck has started throwing codes. Volvo couldn't tell me exactly what it was, but were able to narrow it down to the EGR. So I guess I'll be giving the truck the RAWZE treatment when I get back from Arkansas. Is there a thread with the step-by-step or do I just have to watch the videos over and over until I get it?