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Date: Thu, 22 May 2003 22:18:21 +0200
From: "Simon Putz" <>
Subject: Re: Washer Check Valves - give me some theory

Hi, heh, on my 9000T the jets were clogged too, got new ones from dealer for 12 EUR. installation was like 3 minutes. > The presence of a checkvalve in the nozzles goes back, by the way, at > least to the 1960 Saab model 96; it was necessary in that car because > the wiper fluid "pump" was the driver, pulling out on the knob, > which filled a spring-loaded chamber with the fluid; the spring then pulled > the plunger back in, spraying the windshield. An interesting mechanism > couples that plunger's square shaft, over to an electrical switch for > the wiper motor, so turning it controls the motor, pulling it out > gives the washers fluid to spray. But, it wouldn't have filled up > if it could pull air from the nozzles rather than fluid from the tank, > so the check valves were put into the nozzles at that time. kinda reminds me of the washer system on my buddies vw-porsche 914, the original system was fed pressure from the spare wheel ;) it would only use pressure until there was 2 bar left in the wheel, that was done using a valve. pretty funky idea, but we just installed an electric water pump. bye simon

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