Date:         Fri, 26 Nov 2010 09:15:34 -0700
Reply-To:     Richard A Jones <jones@COLORADO.EDU>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Richard A Jones <jones@COLORADO.EDU>
Subject:      Re: Frozen Windshield Washer Fluid Tip
In-Reply-To:  <201011260504.AEI74764@Colorado.EDU>
Content-Type: text/plain; charset=ISO-8859-1

>>  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