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thom4782 09-09-2018 06:20 AM

Windscreen Washer System
Hi all:

My 951 has two tubes running down into the windscreen washer tank. On line has a valve and the other doesn't. The cap has an L fitting and a T fitting passing through it. My question is: Which fitting - L or T - does the line with the valve get connected to. As you'll see in the parts diagram, there is only one tube shown so it's a bit of a guess as to where it goes.

Of course I could reverse how I have it set up now and see what happens. My guess is the valve keeps the fluid from draining back into the tank so fluid gets sprayed as soon as I pull the level given the line is full.


thom4782 09-10-2018 08:50 PM

Let me ask a better question.

My expectation is that fluid will spray almost instantly from the nozzles when I pull on the wash lever. This doesn't happen on my 944 turbo.n. It seems to take 10 seconds or more for that to happen. By then the wipers have wiped a dry surface multiple times.

My theory is that fluid drains back into the tank so the lines have to refill before spray emerges because one or both check values aren't working. Unfortunately, I mistakenly thought the screen at the end of the line that runs into the tank was a check valve, but now I see they are close to the nozzles.

If my quick spray expectation is right, does the slow spray suggest to you that there's a check value issue? If not, what could it be? When it does spray, the flow is strong and the pattern is excellent.


drkshdw 09-11-2018 03:04 AM

If you hear the pump working and you eventually get fluid to squirt out of the nozzles then your check valve is bad. The purpose of them is to allow fluid to be pumped through the hoses and prevent it from draining back into the tank so when you go to use it next time, fluid quirts out immediately.

They go bad quite often and usually from gunk in the reservoir tank. That screen you saw is what prevents gunk from getting sucked up into the system. It's a good idea to clean it well every time you add fluid to the reservoir.

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