I have a 2012 Chevy Sonic Hatchback that begin at 2,000 miles leaking water into the passenger side floor board when it rains really hard. After taking it to the shop 4 times, the dealer is unable to duplicate the problem but GM tells them a way that should fix the problem. I have noticed a faint antifreeze smell while driving this car when the heat is on sometimes the whole time but I thought that it was a new car smell. I started noticing that I was having more frequent headaches and a scratchy throat the last 4 months. I have several people riding in this car with me that smells this odor but the dealer keeps telling me that they are unable to smell it or find a leak. My husband is a diesel mechanic and he also has smellt this but it has not been found to this day. This smell has to be a health hazard for my family and friends that have rode in my car. I have been dealing with the BBB and GM but there has been no solution to my problem. I have just filed for an arbitration to see if GM will repurchase my vehicle back. I forgot to mention that I bought this car in May 2012 and it has been to the dealer a total of 9 times in a year. I have 2 Chevy Sonic's but I am having no problems with the other one. No consumer should have to spend this kind of money for a brand new vehicle and spend money and time driving back and forth constantly to a dealer to have it checked out. This car has been an inconvenience, headache, money pit, and possibly a health hazard for me and my family.