Wow....I'm so glad I read this thread! My low coolant warning was coming on recently when going up hill or accelerating quickly. I noticed the surge tank was low so I added a gallon of "final charge 50/50" which took care of the warning light.
Of course, the question in my mind is where did the coolant go? I just had my oil analyzed and the results did not detect coolant. But, while I had the coach in my driveway for a week recently I noticed a small puddle of coolant on the paving. I crawled underneath and it appeared to be dripping off a hose very high near the top of the engine towards the radiator. I thought I had a hose slowly leaking and was about to make an appointment for repair.
Now, after reading this thread about all the tank failures on coach's about the same age as ours (2005 Journey), I'm thinking that my plastic tank may be the culprit. The hose with coolant drip is in the same area as the rear of the coolant surge tank. And, another clue is that after refilling the surge tank to mid-level, the puddle in the drive became noticably larger!
Time to investigate the tank! I do most maintenace, but given the access and uncertainties, I wasn't going to get in to the hose replacement. But, I will attempt the tank myself.
Thanks guys for all the background info
Cheers,
Joopy