I've had my 2015 GT for about 18 months and had to add about a quart of coolant to keep level between min and max. Don't know where it is going. I did notice the cap turns off and on really hard. Anyone else notice this on their car?
I had a pressure test on my system done when I was smelling anti-freeze but it came back negative. My coolant was a bit low but only because I hadn't checked it in a year and a half. I don't get the smell but apparently I haven't lost anything to leakage. My cap is also hard to take off, almost impossible when it's hot. I had a 2001 Pontiac Grand Am that had the same problem. Don't think it's anything to be concerned about. When it's cold, I can get it off but it's tight at first. Same thing with my old Pontiac.
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