I recently purchased a 2013 Cruze 2Lt and noticed the coolant was a little low but didn’t move at all on my hour and a half drive home. I topped the coolant off and it still doesn’t seem like it has moved much if at all but I still get the smell inside but it only seems to happen at stops. What could cause a issue like this? I also have a valve cover leak which I believe is caused by the faulty Pcv system and my car has just over 95,000 miles.