Question:
This deals with cold snow and air. First, leave the sun visors in the up position. Second, leave all heat on the floor setting.
When you pull into a truckstop in a snow stowm and you are going to head back out, your windshield will start to get snow on it and it will melt because the outside air temp is no longer keeping the windshield cold. Once you get back on the road DO NOT add heat to your windshield. Just use you intermitent setting on the wipers to clear the water away. As you get back up to speed and are cruising you will notice some ice start to form. This is not a worry. Your windshield is now cold again and the cold air and snow will not stick anymore. The ice will dissapear due to wind erosion <sp>.
Happy Dweller Society - Canadian Division
Answer:
. Your windshield is now cold again and the cold air and snow will not stick anymore. The ice will dissapear due to wind erosion
Don't think so. A very light icing left by the wipers will evaporate, but the wind doesn't make the ice go away. If the windshield is below freezing temperature, snow (from above) and spray (from the road) will freeze on the glass at it's freeezing temperature -- 32 degrees, maybe a couple degrees less if there's some salt in the road spray. The windshield gets a continous blast of cold air again when you resume driving. That rush of air over the outside of the glass becomes more effecient at cooling the windshield as you gain road speed. The only way to keep snow and ice from freeing on your windshield is to keep the windshield warm enough to melt it.

Answer:
Shuffler this post refers to cold dry roads. Cold air and cold dry snow. For all other situations you will need to refer to Part One.
Happy Dweller Society - Canadian Division
Answer:
Ok. But tht's a rare condition -- cold air and dry snow without any spray or build-up. (maybe in Canada )
When driving in sub-freezing temperature and snow or spray is present, anything not removed by the wipers will stick to the glass if the outside surface teamperature of the glass is below freezing.
My point was to set-up for this BEFORE it starts to stick. Keep the windshield warm and you'll never have a problem no matter what you drive into -- at least the part of the glass closest to the defroster vents.
I also keep my mrror heaters on -- again, preventing build-up before it occurs.
And if you can, run your highbeams (heat them up)when there's no conflicting traffic, to keep snow from building up on them either, so they're clear when you might need them...

Answer:
Not so rare. The prairies of Canada and USA get like that in the winter. Also when the temperature drops in the mountians and they only sand and not salt.
Happy Dweller Society - Canadian Division
Answer:
I'm sure youre right about that. I spend most of my time driving mountains -- up and down through changing snow conditions. I suppose you could go a great distance on the northern plains with continous dry snow and cold and could operate without your defroster and only your wipers to clear snow. Especially if there's no headwind, etc.
I'm a little uncomfortable advising newbies that wipers will do the whole job without hot air on the windshield. That can apply to some conditions, but as a general rule, keeping your windshield warm prevents suddenly running blind because conditions have changed and you can't see anymore because your windshield isn't warm enough...

Answer:
The conditions do not change that fast on the prairies that you would run blind. You can get blinded by the snow cloud tossed in your face by other trucks.
Happy Dweller Society - Canadian Division