I know the feeling, I bought my Zed in Feb, had it for a few days and was coming home to see steam coming from my bonnet. Had over heated in Scotland in the winter,,, there was snow on the car to give you an idea how cold it was.
I had the same feeling, totally ruined the new car feeling and thought it was going to be a money pit. However the garage took the car back ( had it for a week) gave me a Mini to help me along. (cooper S JW) Got the car back and it was a fan issue, so they tell me however its been absolute fine ever since. Couldn't think about having another car that wasn't an upgrade from this. You wont regret keeping it !