| Suberman |
01-08-2014 09:25 PM |
Quote:
Originally Posted by jarviz
(Post 1438295)
Hit about -10 to 10 degrees the last couple of days in NYC. I tried turning on my wiper fluids to clean the windshield but nothing came out. The wipers still wiped. I thought maybe I used some generic brand that didn't have anti-freeze.
I go home and the bucket I left outside still has fluid in it... not frozen. This wiper fluid pump worked perfectly fine a couple of days prior to it going below freezing.
Has anybody else has this issue?
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This can happen with any strength of fluid. What happens is the methanol evaporates out of the tiny hole in the jet and the remaining water freezes, blocking the jet. The remaining fluid in the lines and tank doesn't freeze because the methanol only evaporates out of the very end of the system where it is exposed to the air.
Some cars heat their washer jets to deal with this problem. Most rely on the pressure popping the tiny ice plug out. Sometimes the ice plug sticks until the washer jet warms up a little.
Same problem washing a very cold windshield. The washer fluid cleans fine and doesn't freeze while doing so. However, shortly afterwards the methanol evaporates out of the thin fluid film remaining on the windshield and then the water freezes obscuring your view.
Washer fluid is pretty much useless below minus 5C (23F approx) until the car interior warms the windshield. Doesn't matter how strong it is because the more methanol the faster the methanol evaporates leaving some water behind.
Pure methanol would work but it isn't economical. Actually, ethanol also works as does isopropyl alcohol. Each alcohol has a different freeze point and a different antifreeze effect when mixed with water.
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