I'm fortunate that I live in frosty Tucson, so I haven't experienced this problem yet! I do agree that they shouldn't be popping up like already! Have you contacted your dealer concerning this issue?
Once your truck is scheduled you can't make any changes to your build. Ford scheduled your build based on the availability of supplies, of course it doesn't always work out that way. So this why Ford won't let you add or subtract items from your order.