Went to check Stonewall's antifreeze two days ago, found that there was nothing in the reservoir. I thought this was very strange, because when I checked it last week, it was within level. I bought some undiluted dexcool (what I already had in the system, of course) and diluted it myself. (I refuse to pay for 50/50 when I've got water at my house I can mix it with) Topped it off to the full line on the reservoir, let it burp down threw some more in until it was full again, and I've been watching it. In two days, it has dropped down to this:
Unable to find the leak because the coolant had been thrown everywhere, I cleaned everything off with a rag and drove around the neighborhood until my fan came on. Stopped on the side of the road, put on my hazards, and popped the hood. Couldn't see it. Turned the truck off, and still couldn't find it. Wasn't leaking yet, I guess. So I drive back to the house and park out front. Turned it off, gave it a bit, and lo and behold, I done found it.