A good way to prevent snow from getting into air filter chamber and choking air is to tape a nylon stocking over air intake location . will let air in and not snow and will not allow snow to melt and saturate paper filter element
you may have a frozen fan due to water trapped behind it that froze during sheer pin change
Some blowers have a drain holeon bottom of fan housing. If plugged water cant escape after rain or thawed snow in heated garage or warm weather