Stan,
Try running full strength washer fluid in winter and unless your car is pristine and just washed, give it a squirt
when parking for the night; that line full of full strength stuff shouldn't freeze over night.

When my co. cars' lines froze up, I always tried to park in the sun at work and hoped they thawed, though the
drive to work or airport usually thawed them out.

I agree that these Xs have their share of problems exacerbated by any weather colder than "poifect", .
GL,mD