Originally Posted by mikenagy
I know this is an old thread but I cant figure out how to post a new post so I am adding to this one -- new user of the site --
Have 2014 JGC - last winter had multiple occurrences of frozen washer fluid - each time it appeared to be in the reservoir at the bottom of the unit where the pump outtake is. I actually took the reservoir off and emptied it and used the -20 fluid -- it still occurred. used a space heater to defrost it (in my 30F garage) - it worked - but as soon as it went outside again a few hours frozen... Well first cold spell here in 2015 (15F) same thing -- fluid frozen somewhere - this has to be a design flaw... anyone else out there corroborate this? any additional suggestions? additives? beyond what is posted here
Have you tried adding pure isopropyl alcohol?
Unfortunately if you curve the freezing point with different concentrations of isopropanol, it has to be about 80% to get to -35 F and as it gets much below -70 or so it starts thickening up.
Ethanol at 80% freezes at -75 F, where only Alaskans and Rogers Pass Montana folks would need to care, but is hard to find in pure form and is a bit more corrosive.
Methanol at 80% freezes at -125 F, but has some minor drawbacks such as being able to literally make you go blind, high toxicity, corrosivity, etc.
Ethylene Glycol at 60% will take you to just under -60F...
It gets a tad complicated as you start mixing isopropyl and the lowest molecular weight glycols... antifreeze may have other stuff in it for engine protection that gunks up your windshield and washer systems---much like not using rubbing alcohol instead of pure isopropyl.
Odd you can't find -40 washer fluid though...