I read it many, many years ago (like 25...years ago), never did anything.
Yesterday I had at least 1/8" thick solid ice on my windshield and wipers kept freezing while driving.
So, I bought 10ft of windshield washer hose, coiled around the upper radiator hose tightly then ductaped it to keep it together, spliced OEM hose and routed through it.
Now when truck is traveling I can spray warm fluid to windshield and defrost my wipers immediately, no more stopping to shake ice and snow off windshield, and in the morning it will melt ice quickly.

I used the upper radiator hose since I don't want extremely hot water to hit cold windshield and cause temperature shock and crack it .

I know, I might not invented anything fancy, but a something very appreciated here in the north country during wintertime is... a clean windshield I can see through

I'll put it on my wife's Jeep tomorrow.

 

Might wanna figure out how hot that water really is before it gets too cold out. A windshield getting blasted with really cold air on a 0* getting splashed with a 100* fluid is a recipe for major disaster.

 

I don't think there is enough fluid being sprayed or enough heat to cause a problem. From past experience, the temperatures have to be SUBSTANTIALLY different to cause problems and there has to be a lot of fluid involved, such as a garden hose. Also, the fluid sitting in the line will get very hot, but when sprayed into the air in the fashion that windshield systems do that fluid will be cooled a lot by the time it hits the windshield less than a foot away. Hot fluids cool more quickly than you would think when sprayed into cold air. Hot water will crystallize in the air fast than cold water will. I'm not saying damage can not be done, but not likely unless you are trying. Just my .02.

 

That sounds like a good trick. The top hose is from the engine, but it is usuall about 170 in summer on the hose, so your fluid is probley less than 90*F spraying out. You could also add isopropal alchol to the fluid, or a commerical deicer that has glycol in it so it does not refreeze.

 

I just ran around for an hour or so, I sprayed when I stopped the truck and put my hand in front of it. First stream was warm, let's say 80*or 90* at touch, after a while it cooled down to just warm, I'd say 50* to 60*.

With 10ft of hose there's only a dozen of coils, it will not warm up enough to do any damage, but sure enough to melt the snow accumulated on wiper blades.

Glass will never be cold enough to do any damage, by the time I engine warms up water, thermostat opens (at least 1/2 hour running) and warms up fluid the defrosting has windshield already warmed up.