This is just a heads-up to all.
I spent a number of days chasing sporadic coolant leak, I traced it back to one of the coolant elbows. I had just replaced the elbow a few months ago, and was rather surprised that it had failed. After speaking with an aquiantence of mine who owns his own shop, he informed me that he has had a number of problems with the aftermarket elbows leaking in a similar fashion. I have the exact same elbows in a handful of vehicles with only this one failure. My tech friend highly recommended going with the OEM elbows in the future.
Figured this was information that some may find useful.

Is it the elbow or the O ring that'* leaking?

I replaced the O-rings on the elbows, and that has cured the problem. My friend was speculating that the plastic composite may be of lesser quality, and may be distorting over time. I'll probably be heading to the Stealer-ship for some OEM'* for back up in case these fail again.

Mine does the same thing. Just replaced it a couple months ago. I'm not impressed with the Autozone "HELP" elbow parts.

Been using my after market elbows for over a year and no problems at all.

Well, maybe you sealed yours properly DAN!

Yeah, this was a surprise for me too. That'* why I wanted to get the word out in case anyone else was experiencing symptoms like mine.

Good information to know, thanks for posting.

You have to make sure you lube the O rings before putting them in.

Always. No exceptions.
With the new o-rings on, they definitely fit tighter though.