dou­ble- quick time

How to demist your wind­screen in

The Oban Times - - ADVERTISING -

DEMISTING your wind­screen is a ne­ces­sity be­fore set­ting off, as not do­ing so can im­pede your vi­sion while driv­ing which means you will be driv­ing il­le­gally. The cause of your car wind­screen mist­ing up is isn’t di­rectly be­cause of the cold air but ac­tu­ally down to water vapour in the at­mos­phere that oc­curs when your body heats the air in­side the cabin – as does your breath – in­creas­ing the amount of mois­ture it can hold. This means when it comes into con­tact with your wind­screen, it cools and con­denses, form­ing a ‘mist’. There are a few key things to re­mem­ber when at­tempt­ing to clear your wind­screen that can help you clear it in dou­ble-quick time.

1. Use the heater (cor­rectly)

Start the heater off cold, then slowly in­crease the tem­per­a­ture as the air dries out, rather than over­load­ing the cabin with hot, ‘wet’ air. Try to find a tem­per­a­ture and hu­mid­ity that’s com­fort­able but doesn’t mist up the cabin. Make sure your heater’s blast is di­rected at the wind­screen and the win­dows – the warmer air (even on cold the air will be warmer than the ice-cold wind­screen) will dry the glass a lit­tle through evap­o­ra­tion and be­gin to heat up the glass to stop the water vapour con­dens­ing on it again. Of course, if you’re not in a rush and your frozen bones need warmth then use the hot air to warm both you and the wind­screen. It may take a lit­tle longer to clear fully but you will at least be a lit­tle more com­fort­able – just don’t move off un­til all glass sur­faces on your car are clear. It’s dan­ger­ous and il­le­gal if vis­i­bil­ity is im­peded.

2. Use the air-con (if your car has it)

If your car has air-con­di­tion­ing, make sure it is switched on. Use the air-con in con­junc­tion with the heater. Hot air will dry the glass a lit­tle through evap­o­ra­tion, but the air will then cool down and con­dense on the glass once more, so make sure the air-con is on to keep the at­mos­phere in­side dry. If your wind­screen is iced over, then the heat is ob­vi­ously more nec­es­sary. But in this in­stance you might want to scrape the out­side of your wind­screen clear first.

3. If you don’t have air-con or cli­mate con­trol, use your win­dows

If you don’t have a clever cli­mate con­trol sys­tem, driv­ing along with the win­dows down could ac­tu­ally help clear the screen faster. Of course, you should never pull away with your vi­sion im­paired but if your win­dows start to mist up dur­ing driv­ing this is a worth­while tac­tic for those with­out air-con. This helps be­cause the dry, rush­ing air from out­side can help re­duce the amount of water vapour in­side the car, stop­ping the screen mist­ing up.

4. Use your cli­mate con­trol sys­tem (if your car has it)

If you do have a clever cli­mate con­trol sys­tem, utilise it. There’ll most likely be a set­ting for demisting the wind­screen, which will au­to­mat­i­cally ad­just the ven­ti­la­tion sys­tem’s pa­ram­e­ters to achieve the best re­sults.


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