ALSO ... test your coolant with a legit coolant tester. If you need to change it DO NOT EVER, UNDER ANY CIRCUMSTANCE USE GM DEXCOOL If you don't buy Ford brand coolant (and you don't need to) I VERY STRONGLY recommend Zerex G-05 in the gold jug...not green/yellow of the old fashioned regardless of brand.
I do not believe in brand loyalty BUT I do know chemistry - BUT DON'T take my word for it - read the labels and test reviews yourself.
If you plan on keeping the car it's the best choice aside from Mercedes-Benz brand for MUCH more $.
North Dakota, because 30 below zero keeps the riff-raff out.