Anyone have any update on their problem?
I went to the dealer back in May, they just add some coolant and ask me to come back if it leak. I checked it every week for a few weeks and didn't notice anything else. Fast forward to today, I just checked it, it is way less than where I noticed it last time.
Guess I will be bring it in again tomorrow.
1. Keep checking coolant.
2. Drain some engine oil and send to a local lab for oil analysis.
Search to see if there is a lab in your area.
In my city, the people that did the engine oil analysis are the people that service CAT (Caterpillar heavy machinery such as Bobcat, Earth Digger etc.).
Long story short, I lost coolant, initially 1 cup/100 miles, then the loss accelerates to 1 cup/30 miles.
Turned out the cylinderhead aluminum casting was porous and it took 4yr/53K to show up and coolant leak ---> misfire cylinder #1, and #3, loss of coolant but no engine overheat.
Luckily this happened during the 5yr/60K power train warranty. Dealer replaced both cylinder heads, gaskets etc. etc. It cost me nothing but the real cost for this job is about $3500!
Anyway, whatever you do, get an independent engine oil analysis (just drain some oil from the engine pan), if you see coolant, then you likely have the same problem as I did.
I detailed the whole thing here:
http://www.odyclub.com/forums/52-2005-2010-odyssey/27718-coolant-disappearing-reservoir-2.html