its an 02 punto active 8v, been having heating problems with it recently, it overheates until i let the air out and top the water back up again, not sure what the problem is but after bleeding it solves it for a little while, dont know much about cars its my first, anyway iv noticed its been taking longer to start each time, only a fraction longer but noticable, this morning it just wouldnt start, just made one bump noise when i turn the key, any ideas?