![]() That “something” is commonly methanol, a poisonous alcohol made from wood.Īccording to info I found through a Google search, straight methanol freezes at about -145 F. Since straight water freezes at 32 degrees F, something has to be added to winter washer fluid to lower the freezing point. And while it was decidedly frigid here, it certainly never got to 20 below. What made me check this is that several folks I know have complained that their washer fluid – rated to -20 F – froze in Chicago’s recent cold snap. At the time I bought these two - just after a lot of snow and a severe cold snap - both Wal-Mart and Pep Boys were completely sold out. You can also find “summer” fluid good only to freezing, but that can be a problem if it’s still in your reservoir when winter hits. Most common up here is washer fluid good to -20 F, but you can find some good to -25. Yet the thermometer in the test car parked nearby read + 7 F. In my garage are two ancient bottles of washer fluid – both rated to -20 degrees F – that were decidedly slushy this morning. But it’s based on information that at least makes it feasible. This, combined with all the snow we’ve gotten - and the road salt to combat it - can lead to some dangerous driving.Īctually, the following is just a theory. ![]() ![]() Up here in Chicago, the frigid temps have caused many to suffer from frozen washers of late.
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