>> but say it somehow was >> >proven to be true, wouldn't the installation of a simple w/washer >> >check valve resolve this issue? (insert happy face here so I don't get >> >in trouble) > It's better if it runs back down into the reservoir, that way the > nozzle can't freeze except from the outside (which certainly happens > in sleet, wet snow, or once in a while from evaporation of the > alcohol from spray remaining on the outside of the nozzle -- that > takes only a few seconds when you're running down the road). Interestingly, my '88 911 Carrera has three check valves in the system--one just in front of each nozzle and a third that is the T jct in the plumbing. But are they valves that keep any drain- back from happening, or valves that only open at a certain pressure? I can see those Porsche engineers wanting the squirt to blast at 100% from the first instant and so using a pressure valve. Or drain-back valves so that it doesn't take as long for the first squirt to happen. Or some of both.... T valve 914 628 4330 $4.50 (Pelican Parts) line valve 477 955 481 NLA from PP; try dealer Richard |
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