coolant tank problem
I just purchased an AU I Forte and have had no problems, except for one, which has just surfaced. I climb a lot of hills where I live to go visit friends, and on both ocassions the coolant from the overflow tank has emptied below the min line during the trip. This never happens on other runs (having put nearly 600 k's on it in 3 weeks) and I don't believe there is a cooling problem as it never overheats (we've had three straight 40 degree days). I am very happy with my purchase, but this is worrying me. Is it a design fault with the overflow, or something more I should be worried about?
Thanks in advance